cross up

English

Verb

cross up (third-person singular simple present crosses up, present participle crossing up, simple past and past participle crossed up)

1. (Canada, US, informal) To double-cross or betray (someone).

   Synonyms: cross out, stab in the back; see also Thesaurus:betray

2. (slang) To let down, fail or disappoint (someone); to go back on a promise to (someone).

   Synonym: (Australia) dingo

   Antonym: come through