a. To oppose or resist with boldness and assurance: defied the blockade by sailing straight through it.
b. To refuse to submit to or cooperate with: defied the court order by leaving the country.
2. To be unaffected by; resist or withstand: So the plague defied all medicines(Daniel Defoe).
3. To challenge or dare (someone) to do something: She defied her accusers to prove their charges.
[Middle English defien, from Old French desfier, from Vulgar Latin *disfdre : Latin dis-, dis- + Latin fdus, faithful; see bheidh- in Indo-European roots.]
Synonyms: defy, brave, challenge, dare, face These verbs mean to confront boldly and courageously: an innovator defying tradition; braving all criticism; challenged the opposition to produce proof; daring him to deny the statement; faced her accusers.
defy /dfa/ v. [T] -fied, -fying, -fies1 to oppose openly, refuse to obey: The union defied management and went on strike.2 fig. to resist: The lock defied all my efforts to open it.3 to dare or challenge s.o. to do s.t. thought impossible: I defy you to find anything wrong with this plan.