Definition of the heat
: pressure to do something The administration is putting the heat on legislators to approve the tax bill. She's at her best when the heat is on with tight deadlines. The company has turned up the heat on its employees to finish the job quickly.
Note: The expression if you can't stand/take the heat, get out of the kitchen means that you should not try to do a difficult job if you cannot deal with the pressure and problems that are part of the job.
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