Definition (协议)
A matter that is considered settled or certain to happen; an agreement or plan that has been finalized.
板上钉钉；已成定局
Although they haven't signed the contract yet, the deal is practically a done deal.
虽然他们还没签署合约，但这笔交易实际上已经是板上钉钉了。
The merger was virtually a done deal when they announced the agreement.
当他们宣布协议时，这项合并几乎已经是板上钉钉了。
She felt the promotion was a done deal, so she didn't work as hard.
她觉得升职已经是板上钉钉了，所以没有那么努力。