swing at (someone or something)
To attempt to hit someone or something with one's fist or an instrument in a broad, sweeping stroke. Bill didn't hear me coming up behind him, and he swung at me when I touched his shoulder. He grabbed the tennis racket and ran around the yard swinging at the bee.
swing at someone or something
to strike at someone or something. Max swung at the cop—a serious mistake. The batter swung at the ball and missed.
To attempt to hit someone or something with a sweeping stroke: If a batter swings at the ball and misses, it counts as a strike. One of the kids got angry and swung at me with his fist.