Definitions:
move one's hand to and fro in greeting or as a signal

move to and fro with a swaying motion while remaining fixed to one point

style (hair) so that it curls slightly

a long body of water curling into an arched form and breaking on the shore

a sudden occurrence of or increase in a phenomenon, feeling, or emotion

a gesture or signal made by moving one's hand to and fro

a slightly curling lock of hair

a periodic disturbance of the particles of a substance which may be propagated without net movement of the particles, such as in the passage of undulating motion, heat, or sound.