double cross

Genetics a new hybrid produced by crossing two existing hybrids (A × B → AB, C × D → CD, AB × CD → ABCD)
Informal a double-crossing; treachery

transitive verb

Informal to betray (a person) by doing the opposite of, or intentionally failing to do, what one has promised

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See double cross in American Heritage Dictionary 4

transitive verb dou·ble-crossed, dou·ble-cross·ing, dou·ble-cross·es

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

noun

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

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