straighten up
— phrasal verb with straighten uk/ˈstreɪ.tən/us/ˈstreɪ.ən/verb 
(POSITION)
to stand straight after bending at the waist
Thesaurus: synonyms and related words
Making things more or less smooth or straight
- bunch
 - bunch (sth) up
 - coarsen
 - collapse
 - creased
 - crinkle
 - crumple
 - fold
 - furl
 - pucker
 - pumice stone
 - roll sth up
 - roughen
 - sand
 - screw
 - sleek
 - sleek back/down
 - smooth
 - steady
 - straighten
 
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(BEHAVIOUR)
US to behave well after behaving badly:
You'd better straighten up or else!
Thesaurus: synonyms and related words
Becoming better
- alive
 - by/in leaps and bounds idiom
 - come alive idiom
 - come along
 - consolidate
 - move
 - move on to bigger/better things idiom
 - on the up (and up) idiom
 - perk
 - perk up
 - pick
 - rally
 - shape
 - straighten
 - turn over a new leaf idiom
 - turn sth around
 - turn sth round
 - turn the corner idiom
 - warm
 - warm up
 
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