What is the meaning of Nab?

To seize, arrest or take into custody (a criminal or fugitive).

To grab or snatch something.

The summit of a hill.

The cock of a gunlock.

The keeper, or box into which the lock is shot.

pure

prickly pear cactus (clarification of this definition is needed)

snake

worm

Ratliff, Martha (2010) Hmong-Mien language history (Studies in Language Change; 8), Camberra, Australia: Pacific Linguistics, →ISBN, page 277.

Source: wiktionary.org