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1. To stop oneself from saying something that is potentially inappropriate, hurtful, or offensive. I had to bite back a snarky comment as my sister gushed about her new boyfriend.
2. To retaliate against a verbal attack. I wouldn't talk badly about Tiffany, if I were you—she bites back. I mean, you heard the vicious rumor she started about the girl who stole her boyfriend!
3. To retaliate by biting, as by an animal. The dog lunged at the cat, and the cat bit back.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
bite back(at someone or something)
1. Lit. to defend an attack by biting at someone or something. (Usually an animal.) I threatened the dog and the dog bit back.
2. Fig. to fight back at someone; to return someone's anger or attack; to speak back to someone with anger. She is usually tolerant, but she will bite back if pressed. Yes, she will bite back.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.