lock up

lock up {v. phr.}, {slang}

To be assured of success.

How did your math test go? — I locked it up, I think.

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Source: A Dictionary of American Idioms

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under lock and key

[under lock and key] {adv. phr.} Secured; locked up; well protected. * /Dad keeps all his valuables under lock and key./ A Dictionary of American Idioms

pick a/the lock

[pick a/the lock] {v. phr.} To burglarize; open illegally; open a lock without the regular key. * /The robber got into the house by picking the lock./ A Dictionary of American Idioms

lock, stock, and barrel

[lock, stock, and barrel] {n. phr.} Everything; completely. * /The robbers emptied the whole house - lock, stock, and barrel./ Compare: [HOOK, LINE, AND SINKER]. A Dictionary of American Idioms

lock

[lock] See: [SCALP LOCK]. A Dictionary of American Idioms

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