bite one’s tongue—
1. hold back a remark one was about to make:
- The thought … almost slipped out between his lips, but he bit his tongue in time.
2. refrain from discussing smth. embarrassing, etc.:
- However, one recent story proved extremely hard to bite one’s tongue over.
Note: The expression is not equivalent in meaning to the phrase bite one’s lip—keep back one’s anger, annoyance, etc.; repress an emotion:
- It was quiet for a moment, and Robert bit his lip, trying not to giggle like a little girl.
bite the tongue —(of food) be spicy or pungent:
- The cheese has a strong aroma and a lovely salty tang that really bites the tongue.