clinch an argument

See: convince
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PRIOR TO THE MID-20TH CENTURY, A PERSON WHO WANTED TO clinch an argument needed only to reference a pertinent quotation from an authority.
If palaeography has taught us anything, it is that received texts no longer clinch an argument, because it is more apparent than ever before that they have gone through several niveaux of redaction and standardization.
Sir, - Searching for a point to clinch an argument about the British Constitution, I consulted Sir Ivor Jennings' The Law and the Constitution.