1
general::
Phrase(s): cross someone up
to give someone trouble; to defy or betray someone; to spoil someone’s plans. (Also without up.) • You really crossed up Bill when you told Tom what he said. • Please don’t cross me up again.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. Betray, double-cross, cheat, as in Jack crossed up his buddies and told the police they had broken in. Originally this usage often was put simply as to cross. [Early 1800s] 2. Confuse, muddle, as in We all planned to meet at the restaurant but several of us got crossed up as to time and place.
American Heritage Idioms