engrunar

Etymology
Perhaps from, although the noun could also be derived from the verb. If this is the case, the verb could be from a variant form of with an intrusive g.

Verb

 * 1)  to crumble, to reduce to crumbs
 * 2)  to pick off
 * 3)  to shatter, to demolish
 * 4)  to relate in great detail
 * 1)  to shatter, to demolish
 * 2)  to relate in great detail