バ

ッ

ク

noun

1. back, rear.
2. background, backdrop.
3. backing, support, backer, supporter.

noun, takes する, intransitive verb

1. going backwards, reversing, backing up.

noun

1. reverse (gear).

noun, takes する, transitive verb

1. refunding, returning (e.g. profits).

noun

1. Sports term.back (player).
2. backstroke (swimming). Abbreviation.
3. Sports term.backhand. Abbreviation.
4. doggy style (sexual position). Slang.