Etymology
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crossed (adj.)

 "made in the shape of a cross, marked by a line drawn across," past-participle adjective from cross (v.). Figurative sense of "thwarted" is from 1620s. To be crossed out "cancelled by crossing lines" is by 1780. Crossed wires as figurative of confusion, miscommunication is by 1910. 

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Definitions of crossed

crossed (adj.)
placed crosswise;
spoken with a straight face but crossed fingers
crossed forks
seated with arms crossed
crossed (adj.)
(of a check) marked for deposit only as indicated by having two lines drawn across it;
From wordnet.princeton.edu