think again

think again

Reconsider what you have just said, because you are wrong. The phrase is often followed with a presentation of proof of some kind. I know you said he would never show up, but think again, because here he comes. You thought a comeback was impossible? Think again!
See also: again, think
Farlex Dictionary of Idioms.

ˌthink aˈgain

consider a decision again and perhaps change your idea or intention: I’d advise you to think again before leaving your wife.
See also: again, think
Farlex Partner Idioms Dictionary
See also:
  • beck and call
  • (as) sure as eggs (is eggs)
  • a penny for them
  • great minds
  • great minds think alike
  • get thee behind me
  • be twiddling (one's) thumbs
  • be twiddling your thumbs
  • Heinz 57
  • Heinz 57 (variety)
References in classic literature
Certainly, Barbara would think again. No, she didn't see why it was of course.
But when I came to think again, I felt sure that I was doing her wrong in this; and so I went on, as I did at first, hoping to see her once more, just as she used to be.
I could think again, I could feel again, after reading what you have written to me.
If I had any hope of your forgetting her--if I saw you only moderately attracted by one or other of the charming women whom we know here--I should say, let us never speak again or think again of Mrs.
Yet, if death be in this cup, I bid thee think again, ere thou beholdest me quaff it.
"I am neither the Abbe Busoni nor Lord Wilmore," said Monte Cristo; "think again, -- do you not recollect me?" Those was a magic effect in the count's words, which once more revived the exhausted powers of the miserable man.
After a fearful agony and a sense of something huge, bigger than the head itself, being torn out of his jaw, the sufferer, hardly able to believe in his own good luck, feels all at once that what has so long poisoned his existence and enchained his attention, exists no longer, and that he can live and think again, and take interest in other things besides his tooth.
You see, he started to tell me the truth; but when he stopped that way, and begun to study and think again, I reckoned he was changing his mind.
Monson left the room, and Tom began to THINK again.
He showed me letters from his sisters, letters from his brothers, and his dear friends-- all entreating him to think again before he made me his wife; all repeating reports of me in Paris, Vienna, and London, which are so many vile lies.
GMB, the union for ceramics workers, has called on the company to think again and take the redundancies off the table or face the grant being clawed back.
I would politely ask them to think again before taking such action.
Summary: California [United States], September 27 (ANI): If you thought you have protected your personal information enough from the prying eyes of Facebook advertisers, think again.
He told a crowd of all ages: "My message to Trump is to think again about racism, think again about your misogyny, think again about your Islamophobia, think again about climate change, think again about trade unions and workers' rights.
If McGregor truly is a business "mentor", then she has a duty to think again about the type of companies she is involved with.