perish the thought!

perish the thought

Don't even mention that or think that way! Such a thing would be inconceivable. (Sometimes used humorously or sarcastically.) A: "I want you to go and live your life, maybe fall in love again, if something were to ever happen to me." B: "Perish the thought, my love!" Me being disruptive in class? Perish the thought!
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Perish the thought.

Fig. Do not even consider thinking of such a (negative) thing. If you should become ill—perish the thought—I'd take care of you. I'm afraid that we need a new car. Perish the thought.
See also: perish, thought

perish the thought

Don't even think of it. This expression is used as a wish that what was just mentioned will never happen. For example, He's going to give another speech? Perish the thought! This phrase appeared in Handel's oratorio Joshua (1748; text by Thomas Morell): "It never shall be said that our allies in vain implor'd our aid. Perish the thought!" Also see god forbid.
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perish the thought

used, often ironically, to show that you find a suggestion or idea completely ridiculous or unwelcome. informal
1993 Tablet Is he one of those people who file their own press cuttings and who even, perish the thought, write down their own witticisms?
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ˌperish the ˈthought!

(spoken, often humorous) I hope it will not happen; may it never happen: ‘A picnic is a good idea but what if it rains?’ ‘Perish the thought!’
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perish the thought

Used to express the wish that one not even think about something.
See also: perish, thought