straighten up

phrasal verb

straightened up; straightening up; straightens up

Definition of straighten up

1 : to make (something) organized or tidy : to put (something) in order They straightened up the house after the party.

2 : to move the body to an upright position Straighten up. There's no excuse for slouching.

3 US : to improve in behavior You need to straighten up, young man.

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