straighten up

English Thesaurus

1. straighten oneself (verb.motion)

hypernym	:	straighten,
definition	:	get up from a sitting or slouching position (verb.motion)

derivation	:	chin-up, pull-up,
definition	:	an arm exercise performed by pulling yourself up on a horizontal bar until your chin is level with the bar (noun.act)

derivation	:	chin-up, pull-up,
definition	:	an arm exercise performed by pulling yourself up on a horizontal bar until your chin is level with the bar (noun.act)