clincher

The clincher in the negotiation was the offer of a signing bonus.

His impressive resume was the clincher that got him the job.

The clincher goal in the final minute secured their victory.

The clincher for me was when she apologized sincerely.

The clincher to convince him was the promise of a promotion.

The clincher for the deal was the inclusion of a free trial period.

Her strong closing argument was the clincher in the debate.

The clincher for their decision to move was the offer of a bigger house.

The clincher in the presentation was the impressive sales figures.

The clincher for her acceptance of the job offer was the flexible work schedule.

And here is the ultimate clincher for this.