straighten upphrasal 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.
showing great care, attention, and effort
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