This is a way to catch birds. Yahweh continues to compare the people of Israel to doves. When they go to Egypt or Assyria for help, Yahweh will punish them. (See: [[rc://en/ta/man/jit/figs-metaphor]])
Yahweh speaks of the way he will judge Israel as if they were birds that he would catch in a net. Alternate translation: "I will hunt them like birds" or "I will catch them like a hunter catches birds" (See: [[rc://en/ta/man/jit/figs-simile]])