使下定决心;使敲定;使确定
to make someone decide what to do after a lot of thought or discussion
When they said the job would involve travelling to Paris, that clinched it (for her) (= that made her certain that she wanted the job). 他们说这份工作有机会去巴黎,她便决心接受这份工作。
A big proportion of voters claim that the televised debates between candidates may be what clinches it for them.
A jury member explained that the thing that clinched it for her was that the defendant drove the car knowing it was stolen.
We loved the house as soon as we saw it, but it was the garden that clinched it.
I saw him being mean to the dogs and that clinched it. I knew I had to break up with him.
See also: clinch verb (DECIDE)