YOU COULD HAVE FOOLED ME


Meaning of YOU COULD HAVE FOOLED ME in English

( informal ) used to say that you do not believe sth that sb has just told you :

'I'm trying as hard as I can!' 'You could have fooled me!'

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.