Webster's English Dictionary

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betray

Cross references:
  1. reveal                
 
be.tray \bi-'tra-\ \-'tra-(-*)l\ \-'tra--*r\ vb [ME betrayen, fr. be- + 
   trayen to betray, fr. OF trai:rX, fr. L tradere 1: to lead astray; esp : 
   SEDUCE  2: to deliver to an enemy by treachery  3: to fail or desert esp. 
   in time of need  4a: to reveal unintentionally  4b: SHOW, INDICATE  4c: to 
   disclose in violation of confidence  : to prove false  - be.tray.al n