What is the meaning of Clench?

To grip or hold fast.

To close tightly.

Alternative form of clinch (bend and hammer a nail)

Dated form of clinch (make certain, finalize).

A tight grip.

Alternative form of clinch (the act of bending and hammering the point of a nail so it cannot be removed)

A seal that is applied to formed thin-wall bushings.

A local chapter of the Church of the SubGenius parody religion.

A pun.

Source: wiktionary.org