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Meaning of double cross

dou'ble cross'

Pronunciation: [key]
  1. a betrayal or swindle of a colleague.
  2. an attempt to win a contest that one has agreed beforehand to lose. Cf. cross (def. 21).
  3. a cross in which both parents are first-generation hybrids from single crosses, thus involving four inbred lines.

dou•ble-cross

Pronunciation: (dub'ul krôs', -kros'), [key]
— v.t. Informal.
  1. to prove treacherous to; betray or swindle, as by a double cross.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.