cross up
In real, traceable use. Part of the curated seed collection; community review is coming.
Sense 1
Meaning · English
To double-cross or betray (someone).
Register: informal
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Sense 2
Meaning · English
To let down, fail or disappoint (someone); to go back on a promise to (someone).
Register: slang
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “cross up” mean?
To double-cross or betray (someone).
Is “cross up” formal or informal?
cross up is generally informal.