| BAC | the posterior part of a human (or animal) body from the neck to the end of the spine |
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| BAC | the series of vertebrae forming the axis of the skeleton and protecting the spinal cord |
| BAC | the part of something that is furthest from the normal viewer |
| BAC | (football) a person who plays in the backfield |
| BAC | strengthen by providing with a back or backing |
| BAC | establish as valid or genuine |
| BAC | shift to a counterclockwise direction |
| BAC | place a bet on |
| BAC | travel backward |
| BAC | cause to travel backward |
| BAC | support financial backing for |
| BAC | be behind |