idioms

  my lips are sealed  informal (used to say that you will not tell a secret to anyone else) I will not mention this to anyone else. My lips are sealed. Don’t worry, Jane; my lips are sealed. envocabulary.com

  zip your lips spoken (a rude way of telling someone to stop talking) Just zip your lips and get out of here. He knows well when to zip his lips. envocabulary.com

beyond question (completely certain; not in doubt) I believe what she says, her honesty is beyond question. We knew beyond question that this was no accident. envocabulary.com

  out of the question (not possible and therefore not worth discussing) Going out in this stormy weather is out of the question. I had no money, so it was out of the question for me to buy a new car. envocabulary.com

  viper in one’s bosom (someone who betrays those who have helped them) He would steal anything he could. I have reared a viper in my bosom. We just cherished a viper in our bosom. envocabulary.com