Meaning of “fall for sth hook, line, and sinker” in the English Dictionary

british dictionary

"fall for sth hook, line, and sinker" in British English

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fall for sth hook, line, and sinker

to completely believe something that someone tells you that is not true:

She told him she needed the money for her baby and he fell for it hook, line, and sinker.

(Definition of “fall for sth hook, line, and sinker” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)