hold one's tongue   (TTS發音)

remain silent； say nothing of what one knows保持沉默；守口如瓶； 住嘴

    You had better hold your tongue. 你最好不要開口。

    If people would hold their tongues from unkind speech，fewer people would be hurt.人們如果都能保持 不饒舌，很多人就不會受到傷害。

    “Hold your tongue！”he said. “住 嘴！”他說。