means To engage in activity for enjoyment rather than serious purpose, to take part in a game or sport, or to perform music or a role.

from From Old English plegan (or plegian), meaning to exercise, frolic, move rapidly, or make sport — closely tied to the noun plega, 'quick motion, recreation, exercise.' Its older Germanic relatives, like Middle Dutch pleien ('to leap for joy, dance'), carry the same sense of lively bodily motion. From that single root the word fanned out across English: children play, actors play, musicians play, the wind plays through trees — all of them echoing that ancient idea of free, energetic movement done for its own sake.