cross up v.,
informal 1. To block or upset; throw into confusion or disorder.
We were going to catch him at the gate, but he crossed us up by going in the back way. Father crossed up the surprise party we had planned for him by not getting back in time. 2. To deceive or be false to.
George crossed up his partner by selling a lot of things secretly. [TahlilGaran] English Idioms Dictionary ▲