step up

Verb	1.	step up - increase in extent or intensity; "The Allies escalated the bombing" Synonyms: escalate, intensify
	2.	step up - speed up; "let's rev up production" Synonyms: rev up
	3.	step up - make oneself visible; take action; "Young people should step to the fore and help their peers" Synonyms: come forward, come to the fore, step forward, step to the fore, come out

act, come forward, come out, come to the fore, move, step forward, step to the fore