fish or cut bait
fish or cut bait {v. phr.}, {informal}
1. Decide what you want to do and stop wasting time; either act now or give someone else a chance or turn.
Jack couldn't decide whether to go to college or get a job, so his father told him to fish or cut bait.
"Buy the kind of ice cream you want or give someone else in line a chance. Fish or cut bait!"
Compare: MAKE UP ONE'S MIND.
2. Either try hard and do your best, or quit.
Frank missed football practice so often that the coach told him to fish or cut bait.
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Source: A Dictionary of American Idioms
