Meaning of “through thick and thin” in the English Dictionary

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"through thick and thin" in British English

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through thick and thin

C2 If you support or stay with someone through thick and thin, you always support or stay with them, even if there are problems or difficulties:

She has stuck with me through thick and thin.

(Definition of “through thick and thin” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"through thick and thin" in American English

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through thick and thin

in good times and bad times:

My brother has stuck with me through thick and thin.

(Definition of “through thick and thin” from the Cambridge Academic Content Dictionary © Cambridge University Press)