挺身而出

to step forward bravely

straight / erect / to stick out (a part of the body) / to (physically) straighten up / to support / to withstand / outstanding / (coll.) quite / very / classifier for machine guns

to straighten one's back

body / life / oneself / personally / one's morality and conduct / the main part of a structure or body / pregnant / classifier for sets of clothes: suit, twinset / Kangxi radical 158

and / as well as / and so / but (not) / yet (not) / (indicates causal relation) / (indicates change of state) / (indicates contrast)

to go out / to come out / to occur / to produce / to go beyond / to rise / to put forth / to happen / (used after a verb to indicate an outward direction or a positive result) / classifier for dramas, plays, operas etc

variant of 出[chu1] (classifier for plays or chapters of classical novels)