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foil1

pronunciation:
foIl
part of speech: transitive verb
inflections: foiled, foiling, foils
definition: to prevent (a person, plan, enterprise, effort, or the like) from succeeding.
Severe storms foiled their attempt to sail across the ocean in record time.
antonyms:
assist
similar words:
cross, defeat, frustrate, preclude, prohibit, thwart, undercut
derivation: foilable (adj.)