have another think coming


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have another think coming

 and have another guess coming
to have to rethink something because one was wrong the first time. (Think is a noun here.) She's quite wrong. She has another think coming if she wants to walk in here like that. You have another guess coming if you think you can treat me like that!
See also: another, coming, have, think

have another think coming

If you say that someone who thinks a particular thing will happen has another think coming, you mean that they will discover that this is not correct. If he thought he was going to rule her, he had another think coming. If you think that I am driving all the way to Donegal with that noise going on in the background, you have another think coming. Note: This expression is usually used to show that you are angry at what the person wanted and will not accept it.
See also: another, coming, have, think