until one is blue in the face
不管說多少次，都不會改變事實或說服對方
口語·描述無效的反復勸說
英文釋義
to do something excessively or for a long time without achieving the desired outcome
例句
I argued with him until I was blue in the face, but he still wouldn't listen.
典故來源
源于面部因過度用力或情緒激動而發青的現象，形容徒勞無功的反復嘗試。