shake-a-leg noun 1shake a leg verb 1forms 4 noun1 •(Australia) A traditional Aboriginal dance involving rapid movements of the knees.Pretty Mary's clapsticks rang out over the grave while Donny danced shake-a-leg with his father for the very first time and the sight of it made everybody cry, even Kerry. — 2018 shake a leg verb1 •To get busy; to get going; to be productive.Shake a leg! We haven't got all day. formsshook a leg · shaken a leg · shaking a leg · shakes a leg