"To clinch the deal" means to secure or finalize an agreement, contract, or negotiation successfully. It refers to the moment when all parties involved in a deal come to a decision or agreement and close the deal. Full definition
Arsenal may now be too downhearted at the news, as reports are suggesting that their transfer attentions are firmly fixed on clinching a deal for Real Madrid striker Karim Benzema. (caughtoffside.com)
If Nevada does indeed clinch a deal with Tesla, it is most likely due to an attractive package and the state's assets. (entrepreneur.com)
Corker helped clinch a deal on border security in an ultimately doomed 2013 immigration bill and designed a bill to allow Congress to vote on President Barack Obama's nuclear agreement with Iran. (politico.com)