have another guess coming

have another guess coming

(One's) expectations are wrong and unreasonable; (one) better think again. Almost always preceded by "If (one) thinks (something)." If you think you can walk in here and just demand a raise, you've got another guess coming. If he thinks he can hit it big without paying his dues, he's got another guess coming.
See also: another, coming, guess, have

have another guess coming

Also, have another think coming. Be mistaken and therefore have to reconsider or rethink one's answer. For example, If you think you can fool me, you have another guess coming, or John thinks he convinced me; well, he has another think coming. A related idiom is guess again, often used in the imperative, as in You think that car cost $20,000? Guess again! [Colloquial; first half of 1900s]
See also: another, coming, guess, have
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