un‧stuck /ˌʌnˈstʌk◂/ adjective
[Word Family: adjective: sticky, stuck, unstuck, non-stick; noun: sticker, stickiness; verb: stick]
come unstuck
a) British English informal if a person, plan, or system comes unstuck, they fail at what they were trying to achieve:
a dangerous area of rock where many climbers come unstuck
b) if something comes unstuck, it becomes separated from the thing that it was stuck to

[TahlilGaran] Dictionary of Contemporary English ▲