bite one's tongue 的意思其实是让对方“保持沉默”、“别说话”或者“忍住冲动”的意思。

【例句】
I wanted to tell him exactly what I thought of him, but I had to bite my tongue.
我本想明确告诉他我对他的看法，可是不得不保持沉默。

In order to keep peace in your marriage, sometimes you need to bite your tongue.
为了维持婚姻平安无事，有时你要保持沈默谨慎说话。