* Bill became a surgeon, but later he found the job to be too stressful. The other surgeons told Bill that if he can't stand the heat, then he should get out of the kitchen and find a more suitable profession.
Know Your Phrase - The Origins And Meanings For Idioms And Phrases  |  I-Letter Sayings
Phrases and Idioms

A list of phrases starting with the letter I.
The meaning for the idiom 'if you can't stand the heat, get out of the kitchen.'
The origins of this is saying:
Example sentences
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If an activity or task is too difficult to do, then perhaps it would be best to stop doing it.
It's thought that Harry S. Truman is the one who coined the phrase, and he used it as early 
as 1942. A newspaper from that year, called The Soda Springs Sun, quoted him:

    "Favorite rejoinder of Senator Harry S. Truman, when a member of his war contracts 
     investigating committee objects to his strenuous pace: 'If you don't like the heat, get out 
     of the kitchen."

So, the idea here with this expression is something like this: With ovens turned on and pans heating up on the stove, the temperature in the kitchen can rise, becoming a hot place to work in. Some people might be uncomfortable working or just being in such a heated environment. Thus, if that's the case, it would probably be best for them to get out of the kitchen and leave the work to someone else.
Cooking in a kitchen.