NAB

nab. Nab, v.t. to catch by surprise, catch, bite

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Nab (năb), n. [[Cf. Knap, Knop, Knob.]] 1. 1. The summit of an eminence. Halliwell.
2. 2. (Firearms) The cock of a gunlock. Knight.
3. 3. (Locksmithing) The keeper, or box into which the lock is shot. Knight.