Meaning

• A diurnal predatory bird of the family Accipitridae, smaller than an eagle.

  "It is illegal to hunt hawks or other raptors in many parts of the world."

• Any diurnal predatory terrestrial bird of similar size and appearance to the accipitrid hawks, such as a falcon

• An advocate of aggressive political positions and actions.

• An uncooperative or purely-selfish participant in an exchange or game, especially when untrusting, acquisitive or treacherous. Refers specifically to the Prisoner's Dilemma, alias the Hawk-Dove game.

Meaning

• To hunt with a hawk.

• To make an attack while on the wing; to soar and strike like a hawk.

  "to hawk at flies"