Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: French
Origin: fouler 'to step on'

foil

2 verb
     
foil2 [transitive often passive]
to prevent something bad that someone is planning to do:
A massive arms-smuggling plan has been foiled by the CIA.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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