noun

1. The rear, back-end

2. Butt, the buttocks, bottom

3. A one-point score.

adverb

1. At the back part; in the rear.

2. Toward the back part or rear; backward.

   “to look behind”

3. Overdue, in arrears.

   “I'm two weeks behind in my schedule.”

preposition

1. At the back of; positioned with something else in front of.

   “The car is behind the wall.”

2. To the back of.

3. After, time- or motion-wise.

Synonyms: in back of, to the rear of