How did “tongue-in-cheek” get its current meaning?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Luau

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Chapters
00:00 How Did “Tongue-In-Cheek” Get Its Current Meaning?
00:18 Accepted Answer Score 10
00:51 Answer 2 Score 1
02:04 Thank you

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Tags
#meaning #etymology #expressions

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