沪友详解A：bite one's tongue
bite one's tongue 不说话,保持沉默.将舌头放在牙齿中间，以防说出一些会让人后悔的事。
也可以写成hold one's tongue 控制住舌头
eg.You'd better bite your tongue and not say a word of this to anyone!

英汉
bite one's tongue
忍住不说
英英
1、bite one's tongue 保持缄默
bite off more than one can chew 承担力所不及的事
2、bite one's tongue 保持缄默
bite the hand that feeds one 恩将仇报，忘恩负义
例句
1、Mustard and pepper bite the tongue.
芥末和胡椒粉刺痛舌头。
2、One's tongue runs before one's wit.
不加考虑，冲口而出。
3、One may hold one's tongue in an ill time.
时辰不利休开口。