What is the meaning of Nab?

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

To grab or snatch something.

To steal or copy another user's post.

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