sing a different tune

sing a different tune или whistle a different tune также sing a new tune  {v. phr.},  {informal}

Говорить или действовать противоположным образом; противоречить сказанному ранее.

Charles said that all smokers should be expelled from the team but he sang a different tune after the coach caught him smoking.

Син.:

CHANGE ONE'S TUNE,

DANCE TO ANOTHER TUNE.

Ср.:

LAUGH OUT OF THE OTHER SIDE OF ONE'S MOUTH.