To clasp; to interlock.
To make certain; to finalize.
I already planned to buy the car, but the color was what really clinched it for me.
To fasten securely or permanently.
To bend and hammer the point of (a nail) so it cannot be removed.
To embrace passionately.
To hold firmly; to clench.
To set closely together; to close tightly.
to clinch the teeth or the fist