从字面上理解，mum istheword的意思是“沉默是唯一的话语”，其引申意义为“要保守秘密，不要说出赴”。

If you tell someone that mum is the word, you ask he or she to keep something secret.

youdao

从字面上理解，mum istheword的意思是“沉默是唯一的话语”，其引申意义为“要保守秘密，不要说出赴”。

If you tell someone that mum is the word, you ask he or she to keep something secret.

youdao