behind PREPOSITION & ADVERB 1) at or to the back or far side of. 2) further back than other members of a moving group. 3) in support of. 4) responsible for (an event or plan). 5) less advanced than. 6) late in accomplishing or paying something. 7) remaining after the departure or death of.
NOUN informal a person's bottom.
ORIGIN Old English.

English terms dictionary. 2015.