定了

definitely; for sure, it's settled

→ 定
phrase Common #3,248
definitely; for sure Follows a verb to express certainty or a firm decision. In 死定了, it means someone is doomed.
CH: 这次比赛我们赢定了。
EN: We’re sure to win this match.

我演定了

I've decided.

— 红磨坊 (2001)

我演定了这角色

I'm set to play this role.

— 穆赫兰道 (2001)

下回我带你去说定了,去那家夜店

Next time, I’ll take you to that nightclub—it’s a deal.

— 托尼·厄德曼 (2016)

我这份大礼,你今天收定了!

You’re definitely accepting this big gift from me today!

— 功夫 (2004)

phrase Rare #14,318
it's settled Used to confirm that a decision or arrangement has been finalized.
CH: 我们周六见面,就这么定了。
EN: We’ll meet on Saturday. It’s settled.

遗憾的是,这事我们已经定了

Unfortunately, we've already made the decision.

— 末代皇帝 (1987)

什么定了

What has been decided?

— 触不可及 (2011)

现在终于定了

It’s finally decided.

— 妈咪 (2014)

就这么定了

It's settled, then.

— 阿黛尔的生活 (2013)

好的,就这么定了

Okay, it’s settled then.

— 密阳 (2007)

就这么定了啊

It's settled, then.

— 密阳 (2007)

那就是定了

Then it’s settled.

— 触不可及 (2011)

说定了

It's a deal.

— 红磨坊 (2001)

太棒了,我要定了

Awesome, I’ll take it.

— 天空之城 (1986)