LATIN DICTIONARYLexicon Latīnum
verbirregular conjugation, suppletive, no passive, no supine stem except in the future active participle, no gerund

dēsum

dēsum (present infinitive deesse, perfect active dēfuī, future active participle dēfutūrus)
Classical[ˈdeː.sũː]Ecclesiastical[ˈdɛː.s̬um]
№ 463 of the 1,000 commonest wordsMille Verba core vocabulary

Meaning

  1. suppletiveto be wanting/lacking (+ dative)
    Dominus pāscit mē et nihil mihī dēerit.The Lord is my shepherd and nothing shall I want.
    [...] nōn dēest reī pūblicae cōnsilium neque auctōritās hujus ōrdinis: nōs, nōs, dīcō apertē, cōnsulēs dēsumus.The Republic lacks neither the judgment nor the authority of this body: [it is] we — we, I say openly — we the consuls [who] are lacking.63 BCE, Cicero, In Catilinam orationes 1.3
  2. suppletiveto fall short of, fail to obtain, miss
  3. suppletiveto abandon, to desert, to neglect
    Dīmicantī dē fāmā deesse.To abandon one whose reputation is attacked.
  4. suppletiveto be away, to be absent, to be missing

Latīnē defined in Latin in our graded readers

nōn adsum ubi esse dēbeō; ūnus locus vacuus: ūnus deest.
dēsum -esse dēfuī — in Mille Verba, Fūnus et Memoria

Choosing the right word Döderlein's Latin Synonyms

Abesse · Deesse · Deficere

1. Abesse denotes absence as a local relation, ‘to be away’ from a place; but deesse denotes an absence by which a thing is rendered incomplete, and means ‘to fail,’ ‘to be wanting,’ in opp. to esse and superesse. Cic. Brut. 80. Calidio hoc unum, si nihil utilitatis habebat, abfuit, si opus erat, defuit. 2. Deesse denotes a completed (i.e. already existing), deficere a commencing state. Cic. Verr. i. 11. Vererer ne oratio deesset, ne vox viresque deficerent. (v. 339.)

Conjugation future irregular no supine

active indicative
formpresentimperfectfutureperfectpluperfectfut. perfect
1st sg.dēsumdēeramdēerōdēfuīdēfueramdēfuerō
2nd sg.dēesdēerāsdēeris
dēere
dēfuistīdēfuerāsdēfueris
3rd sg.dēestdēeratdēeritdēfuitdēfueratdēfuerit
1st pl.dēsumusdēerāmusdēerimusdēfuimusdēfuerāmusdēfuerimus
2nd pl.dēestisdēerātisdēeritisdēfuistisdēfuerātisdēfueritis
3rd pl.dēsuntdēerantdēeruntdēfuērunt
dēfuēre
dēfuerantdēfuerint
active subjunctive
active subjunctive
formpresentimperfectperfectpluperfect
1st sg.dēsim
dēsiem, dēfuam
dēessem
dēforem, dēssem
dēfuerimdēfuissem
2nd sg.dēsīs
dēsiēs, dēfuās
dēessēs
dēforēs
dēfuerīsdēfuissēs
3rd sg.dēsit
dēsiet, dēfuat
dēesset
dēforet
dēfueritdēfuisset
1st pl.dēsīmus
dēsiēmus, dēfuāmus
dēessēmus
dēforēmus
dēfuerīmusdēfuissēmus
2nd pl.dēsītis
dēsiētis, dēfuātis
dēessētis
dēforētis
dēfuerītisdēfuissētis
3rd pl.dēsint
dēsient, dēfuant
dēessent
dēforent
dēfuerintdēfuissent
imperative
imperative
formactivepassive
pres. 2nd sg.dēes—
pres. 2nd pl.dēeste—
fut. 2nd sg.dēestō—
fut. 3rd sg.dēestō—
fut. 2nd pl.dēestōte—
fut. 3rd pl.dēsuntō—
infinitives & participles
infinitives & participles
formactivepassive
present infinitivedēesse—
perfect infinitivedēfuisse—
future infinitivedēfutūrum esse
dēfore
—
future participledēfutūrus
dēfutūra, dēfutūrā, dēfutūrae, dēfutūram, dēfutūrārum, dēfutūrās, dēfutūre, dēfutūrī, dēfutūrīs, dēfutūrō, dēfutūrōrum, dēfutūrōs, dēfutūrum
—

Phrases from Meissner's Latin Phrase-Book

occasioni deesse
to neglect an opportunity.
saluti rei publicae non deesse
to further the common weal.
officio suo deesse (Fam. 7. 3)
to neglect one's duty.
huic rei deest apud nos vocabulum
we have no expression for that.
rei publicae deesse (opp. adesse)
to take no part in politics.
tempus mihi deest ad aliquid faciendum
I have no time to do something.
alicui petenti satisfacere, non deesse
to accede to a man's petitions.
percontanti non deesse (De Or. 1. 21. 97)
to answer every question.
1 more phrases
deest mihi argumentum ad scribendum (Att. 9. 7. 7)
I have nothing to write about.

dē-sum, fŭi, esse (ee in deest, deesse, deerit, etc., in the poets
I. per synaeresin as one syll., Lucr. 1, 44; Cat. 64, 151; Verg. G. 2, 233; id. A. 7, 262; 10, 378; Hor. Ep. 1, 12, 24; Ov. M. 15, 354 et saep.; praes. subj., desiet, Cato R. R. 8; perf., defuerunt, trisyl., Ov. M. 6, 585; fut. inf., commonly defuturum esse, as Cic. Div. in Caecil. 1, 2, etc.; also defore, id. Fam. 13, 63; Caes. B. G. 5, 56; Sil. 9, 248; imperf. subj., deforent, Ambros. Hexaem. 3, 13), v. n., to be away, be absent; to fail, be wanting (for syn. cf.: absum, deficio, descisco, negligo; freq. in all periods).
I. In gen.
(a). Absol.: non ratio, verum argentum deerat, Ter. Ph. 2, 1, 69: frigore enim desunt ignes ventique calore Deficiunt, Lucr. 6, 360: cf. id. 3, 455; Cato R. R. 8: omnia deerant, quae, etc., Caes. B. G. 4, 29 fin.: semper paullum ad summam felicitatem defuisse, id. ib. 6, 43, 5: ibi numquam causas seditionum et certaminis defore, Liv. 45, 18: quod non desit habentem, etc., Hor. Ep. 2, 2, 52 et saep.: non desunt qui, for sunt qui, Quint. 4, 5, 11; 8, 3, 85; Plin. 2, 109, 112, § 248.—
(b). With dat. (so most freq.): metuo mihi in monendo ne defuerit oratio, Plaut. Bac. 1, 1, 3 and 4: cui nihil desit, quod, etc., Cic. Rep. 1, 17; cf. id. Lael. 14, 51: sive deest naturae quippiam, sive abundat atque affluit, id. Div. 1, 29, 61: quantum alteri sententiae deesset animi, tantum alteri superesse, Caes. B. C. 2, 31; so, opp. superesse, Cic. Fam. 13, 63; cf. opp. superare, Sall. C. 20, 11: neu desint epulis rosae, Hor. Od. 1, 36, 15; id. Ep. 1, 1, 58 et saep.: hoc unum ad pristinam fortunam Caesari defuit, Caes. B. G. 4, 26 fin.; cf. id. B. C. 3, 2, 2; 3, 96, 2. —
(g). With in: ut neque in Antonio deesset hic ornatus orationis, neque in Crasso redundaret, Cic. de Or. 3, 4 fin.; id. Rep. 2, 33: in C. Laenio commendando, id. Fam. 13, 63 al.—
(d). With inf. (poet. and in postAug. prose): et mihi non desunt turpes pendere corollae, Prop. 1, 16, 7; Sil. 6, 10; Tac. H. 4, 1 al.—(ε) With quominus: duas sibi res, quominus in vulgus et in foro diceret, defuisse, Cic. Rep. 3, 30 fin. (ap. Non. 262, 23); Tac. A. 14, 39.—(ζ) With quin: nihil contumeliarum defuit, quin subiret, Suet. Ner. 45.—(η) With ut: non defuit, ut, etc., Capitol. Gord. III. 31.—
II. Pregn., to fail, be wanting in one's duty, as in rendering assistance, etc.; not to assist or serve, to desert one, to neglect a person or thing.
(a). With dat.: tantum enitor, ut neque amicis neque etiam alienioribus opera, consilio, labore desim, Cic. Fam. 1, 9, 17; cf. id. Mur. 4 fin.: ne tibi desis, that you be not wanting to yourself, neglect not your own advantage, id. Rosc. Am. 36, 104; id. Fam. 5, 12, 2; cf. Hor. S. 1, 9, 56; 2, 1, 17; 1, 4, 134: senatu reique publicae, Caes. B. C. 1, 1, 3 sq.: communi saluti nulla in re, id. B. G. 5, 33, 2: Timotheo de fama dimicanti, Nep. Timoth. 4, 3: huic rei, Caes. B. C. 3, 93, 2: negotio, id. ib. 2, 41, 3: decori vestro, Cic. Rep. 6, 24: officio et dignitati meae, id. Att. 7, 17, 4; Liv. 3, 50: tempori, id. 21, 27; cf.: occasioni temporis, Caes. B. C. 3, 79 et saep.—
(b). Without dat.: non deest reipublicae consilium ... nos, nos, dico aperte, consules desumus, Cic. Cat. 1, 1 fin.; id. Rep. 3, 21: qui non deerat in causis, id. Brut. 34, 130: nec deerat Ptolemaeus, Tac. H. 1, 22 fin.—
B. To fall short of, miss, fail to obtain: ne quis desit gratiae Dei, Vulg. Heb. 12, 15.

Origins

  1. Proto-Indo-European*de
  2. Proto-Indo-European*déh₁
  3. Proto-Italic*dē
  4. Latindēsum

Latin dē- Latin sum Latin dēsum From dē- + sum.

Quick answers

What does dēsum mean in Latin?
dēsum, a verb, means “to be wanting/lacking (+ dative); to fall short of, fail to obtain, miss; to abandon, to desert, to neglect”.
What are the principal parts of dēsum?
dēsum, deesse, dēfuī, dēfutūrus (irregular conjugation, suppletive, no passive, no supine stem except in the future active participle, no gerund).
How do you pronounce dēsum?
In classical Latin, [ˈdeː.sũː]; in ecclesiastical (church) Latin, [ˈdɛː.s̬um].
Where does dēsum come from?
Proto-Indo-European *de → Proto-Indo-European *déh₁ → Proto-Italic *dē → Latin dēsum.