'A' shakes his fist at Z, intending or knowing it to be likely that he may thereby cause to believe that A is about to strike Z, A has:

S.351. Assault .—Whoever makes any gesture, or any preparation intending or knowing it to be likely that such gesture or prepa­ration will cause any person present to apprehend that he who makes that gesture or preparation is about to use criminal force to that person, is said to commit an assault. Explanation.—Mere words do not amount to an assault. But the words which a person uses may give to his gestures or preparation such a meaning as may make those gestures or preparations amount to an assault. Illustrations (a) A shakes his fist at Z, intending or knowing it to be likely that he may thereby cause Z to believe that A is about to strike Z, A has committed an assault.