1[no object]To bend, stoop, or duck, as though passing under a low bridge. Now rare.
2[with object]Baseball. To cause (a player) to duck out of the way of a fast moving ball; (now chiefly) specifically (of a pitcher) to force (a batter) to duck by throwing a ball close to the batter's head, especially for the purpose of intimidation.
Origin
Late 19th century; earliest use found in The New York Times. From low + bridge.