Verb
cross up (third-person singular simple present crosses up, present participle crossing up, simple past and past participle crossed up)
(Canada, US, informal) To double-cross; to betray.
I knew I was crazy because I was watching Jesus Christ Superstar and the part where Jesus carries the cross up the mountain, I actually said to myself, "Wow! That must be a really good workout! Yeah, because you're doing arms and cardio!" Margaret Cho