nab /næb/noun 3verb 3forms 3 noun3 •The summit of a hill.At Clayton point and other nabs to the south of Scarborough. — 1828 •The cock of a gunlock. •The keeper, or box into which the lock is shot.the Bottom of the Bit may fall almost to the Bottom of the Nab , and shoot the Bolt back — 1703 verb3 •(informal) To grab or snatch something. •(informal) To seize, arrest or take into custody (a criminal or fugitive).As I was going out of the door, a fellow detective came hurriedly in. "Nabbed them," cried he. — 1887 •(Internet) To steal or copy another user's post. formsnabbed · nabbing · nabs