Definitions

1. noun

muscles of the abdomen, especially those used in breathing, or a set of exercises to develop these muscles

“She started doing abs to lose weight and get toned.”

2. verb

to contract the abdominal muscles

“He abs to help him get back to an upright position after falling.”

3. adjective

relating to the abdomen

“The abs injury kept him out of the game for weeks.”

4. verb (informal)

to leave or dismiss abruptly

“The company abs its employees without giving them any notice.”