Webster's English Dictionary

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defy

1. de.fy \di-'fi-\ vt [ME defyen to renounce faith in, challenge, fr. OF 
   defier, fr. d]e- + fier to entrust, fr. (assumed) VL fidare, alter. of L 
   fidere to trust archaic  1: to challenge to combat  2: to goad into trying 
   to perform something proposed as impossible  3: to confront with assured 
   power of resistance {~ public opinion)>
2. de.fy \di-'fi-, 'de--.fi-\ n : CHALLENGE, DEFIANCE