two

Old English twa, fem. and neuter form of twegen "two" (see twain), from Proto-Germanic *twai (cf. Old Saxon and Old Frisian twene, twa, Old Norse tveir, tvau, Dutch twee, Old High German zwene, zwo, German zwei, Gothic twai), from PIE *duwo (cf. Sanskrit dvau, Avestan dva, Greek duo, Latin duo, Old Welsh dou, Lithuanian dvi, Old Church Slavonic duva, first element in Hittite ta-ugash "two years old").

Dance style two-step is recorded from 1900. Twofer is first recorded 1911 (originally in reference to cigars), from two for (a dollar, etc.). Two cheers for _____, expressing qualified enthusiasm first recorded 1951 in E.M. Forster's title "Two Cheers for Democracy." Two-dimensional is recorded from 1883; figurative sense of "lacking substance or depth" is attested from 1934.

Draw the proper inference from existing evidence, as in Putting two and two together, it's not hard to guess who will be chosen for the lead role in the play. [Mid-1800s]

In addition to the idioms beginning with two

• two bits
• two can play at that game
• two cents
• two left feet, have
• two of a kind
• two shakes of a lamb's tail
• two strikes against
• two strings to one's bow
• two ways about it
• two wrongs do not make a right

also see:

• fall between the crack (two stools)
• for two cents
• game that two can play
• goody-two-shoes
• in two shakes
• it takes two
• kill two birds with one stone
• know all the answers (a thing or two)
• lesser of two evils
• like as two peas in a pod
• no two ways about it
• of two minds
• put two and two together
• that makes two of us
• thing or two
• wear two hats