From Longman Dictionary of Contemporary Englishshake a legshake a legspokenHURRY used to tell someone to hurry, or quickly start doing something C’mon, shake a leg! → shake
Examples from the Corpus
shake a leg• If we want to get there by 11:00, we'd better shake a leg.• Outside the others were shouting for Kerry to shake a leg.• The business of the audition is squeezed into all this in less time than it takes to shake a leg.• On shaking legs he began to descend.• I stood on my shaking legs, my head on the public phone. 