I. adverb or adjective
Etymology: Middle English behinde, from Old English behindan, from be- + hindan from behind; akin to Old English hinder behind — more at hind
Date: before 12th century
a. in the place or situation that is being or has been departed from <stay behind> b. in, to, or toward the back <look behind> <came from behind> c. later in time <can spring be far behind> 2. a. in a secondary or inferior position b. in arrears <behind in the rent> c. slow 3. archaic still to come II. preposition Date: before 12th century 1. a. in or to a place or situation in back of or to the rear of <look behind you> <put behind bars> b. — used as a function word to indicate something that screens an observer <the sun went behind a cloud> c. following in order <marched behind the band> 2. — used as a function word to indicate backwardness, delay, or deficiency <behind the times> <behind schedule> <lagged behind last year's sales> 3. a. in the background of <the conditions behind the strike> b. out of the mind or consideration of <put our troubles behind us> c. beyond in depth or time <the story behind the story> <go back behind St. Augustine> 4. a. in support of ; on the side of <solidly behind the candidate> b. with the support of <won 1-0 behind brilliant pitching> III. noun Etymology: 1behind Date: circa 1830 buttocks — often used as a euphemism for ass in idiomatic expressions <get your behind over here>
New Collegiate Dictionary. 2001.