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Synonyms
dou·ble-cross (dŭb́əl-krôś, -krŏś)

transitive verb: -crossed, -cross·ing, -cross·es. 

To betray by acting in contradiction to a prior agreement. See synonyms at deceive

noun 

  1. An act of betraying an ally, a friend, or an associate.
  2. Genetics A cross in which each parent is the product of a single cross. It can be represented as AB × CD, where A, B, C, and D are inbred lines.

derivatives

doúble-crosśer
noun