LATIN DICTIONARYLexicon Latīnum
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“undertake” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

undertake
incipere (to begin, especially in a bold or spirited manner): aggredi aliquid or ad aliquid (to attack): sumere (to take in hand): suscipere (to take upon one’s self): recipere (to become responsible for): moliri (to endeavor to accomplish something difficult or laborious; this is construed also with an infinitive): conari (to begin something that requires effort and pain; usually with an infinitive): audere (to attempt something dangerous or hazardous; usually with an infinitive): To undertake a work or labor, laborem sumere, suscipere, or recipere: to undertake a war, bellum incipere, sumere, or suscipere: to undertake a journey, iter incipere, aggredi, or inire (to enter upon): iter suscipere (as a business or charge):
Engage [Vid. ENGAGE, intransitively].
To undertake the care or charge of, curare: tueri (to keep in one’s sight or care): recipere, suscipere (to take upon one’s self, the latter especially from one’s own impulse; all followed by an accusative). To undertake the charge of anybody, curare de aliquo diligenter (to take care of): prospicere or consulere alicui: consulere et prospicere alicujus rationibus (to consult his good): aliquem tueri or defendere (to protect, defend him): aliquem tueri et defendere, or aliquem tueri eique consulere; suscipere or recipere aliquem; adesse alicui (especially in a court of justice). To undertake the entire charge of anybody, totum aliquem suscipere ac tueri: to cease to undertake the charge of anybody, aliquem abjicere: not to undertake anybody’s cause, deesse alicui (especially in a court of justice): to undertake the care of anything, curam alicujus rei suscipere: tueri et defendere rem (to defend): causam suscipere or recipere; causam tueri (in a court of justice). To undertake the care of the commonwealth, the state, suscipere salutem reipublicae: to undertake the management of anything in good earnest, incumbere in rem (☞ not alicui rei): with the utmost zeal, omni cogitatione curaque incumbere in rem: not to undertake the care of a thing, rem negligere.

Quick answer

What is the Latin word for undertake?
The usual Latin words for “undertake” are incipiō, sūmō, suscipiō; also recipiō, mōlior, cōnor. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.