S: (v) betray (betray%2:41:00::), sell (sell%2:41:00::) (deliver to an enemy by treachery) "Judas sold Jesus"; "The spy betrayed his country"
S: (v) fail (fail%2:37:00::), betray (betray%2:37:00::) (disappoint, prove undependable to; abandon, forsake) "His sense of smell failed him this time"; "His strength finally failed him"; "His children failed him in the crisis"