Come unstuck
Definition 1 of 1
Pro Tip 1/3Unexpected Setbacks
Used when something goes wrong suddenly after a period of doing well. 
The team had won five matches, but came unstuck in the final.
Pro Tip 2/3Colloquial Usage
Primarily used in informal speech and writing rather than formal or business contexts. 
He thought he'd fixed the engine, but it came unstuck on the test drive.
Pro Tip 3/3Avoid Literal Use
Not typically used in the literal sense of becoming unstuck; usually figurative for plans or efforts failing. 
Her strategy for the exam came unstuck, leading to a lower grade.