fall for something hook, line and sinker

Từ điển tiếng Anh - Cambridge Advanced Learners Dictionary

fall for sth hook, line and sinker idiom
to completely believe something that someone tells you which is not true
• She told him she needed the money for her baby and he fell for it hook, line and sinker.
Thesaurus⁺: ↑Cheating and tricking ↑Plotting and trapping
Main entry: hook_idiom