to settle (a matter) decisively: After they clinched the deal they went out to celebrate.
2.
to secure (a nail, screw, etc.) in position by beating down the protruding point: He drove the nails through the board and clinched the points flat with a hammer.
3.
to fasten (objects) together by nails, screws, etc., secured in this manner.
1570, "clasp, interlock," var. of clench. The sense of "settle decisively" is first recorded 1716, from the notion of "clinching" the point of a nail to keep it fast. Boxing sense is from 1860.
tv. to settle something; to make something final. : I was able to clinch the deal, and I got a raise for it.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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