“double” in Latin

duplex (two-fold; a multiplicative; denoting the double as distinct magnitudes to be counted; e.g., fossas, vallum, stipendium): duplus (a proportional; representing double as continuous magnitudes to be weighed or measured; duplex as adjective, duplum as substantive): geminus (of which each is twin to the other; duplex denotes doubleness with similarity or equality; geminus denotes similarity or equality with doubleness; Döderlein): geminatus (repeated over again in exactly the same form, etc.): anceps (having two heads; hence, figuratively, having two sides or directions; that may be considered in two points of view.”In anceps there always lies the notion of what is doubtful, critical, or dangerous; not that of simple doubleness,” Herz. ad Caes., B.G., 1, 26): bipartitus (divided into two parts). A soldier who receives double rations, miles duplicarius: a double victory, victoria geminata. THE DOUBLE, duplum: alterum tantum (for which duplex appears first in Liv.): bis tantum (Varr.). A double victory, victoria geminata (Liv.): proelium anceps (Caes., Nep.): to make double, duplicare, geminare. A double cloak, amiculum duplex (Nep.). A double saw, ex omni parte dentata serra or serrula (Vid: Cic., Cluent., 64, 180). A double sense, ambiguitas (e.g., verborum): suspicio ridiculi abscondita (double-entendre). A double sun, sol geminatus: soles bini (two seen at once, Sen., Quaest. Nat. 1, 11, 1). A double door, fores bifores or only fores (having two leaves; if each is folded like a window-shutter, they are called valvae). Double-tongued, bilinguis (speaking two languages; also figuratively hypocritical, etc.): ambigui ingenii (deceitful, etc.): bisulcilingua only comedy, Plaut., Poen., 5, 2, 74. A double tongue, ambiguum ingenium.

Twice as much, duplum; alterum tantum; bis tantum (Varr.).

A turn in running, flexus (Quint.).

A trick, etc., Vid: perhaps fiexiones: maeandri (after quos tu maeandros - quae deverticula flexionesque quaesisti, Cic.; but in him it is said of a person returning by by-ways, etc., under circumstances of disgrace).

TRANS., duplicare (the proper word, PROP. and figuratively): geminare (to put two things together so that they may appear a pair; to put two equal things together; e.g., legionum castra).

To sail round a cape, flectere promontorium (Cic., Divin., 2, 45, 94): circumvehi promontorium (Liv. 10; also participle active circumvehens, as he was doubling, etc.).

To double down a leaf, *schedae marginem replicare (marginem replicare, Plin., 9, 33, 52).

INTRANS., duplicari.

To double and turn, huc atque illuc tergiversari: maeandros multos flexionesque quaerere [Vid: quotation under DOUBLE, s.] : to elude by doubling, flexu eludere (Quint.).