This is a very common expression that we use to say we have changed our decision plan or opinion about something.

这是一个非常常见的表达 表示我们"改变心意/决定/计划/意见"等

-Hey Mike.

嗨 麦克

-Yeah?

什么事

-I changed my mind, I don't want to do this.

我改变主意了 我不想干这行了

Then as Jack instructs rose on what to do he says:

接着 杰克让露丝按照他说的做

-Now hold on to the railing, keep your eyes closed, don't peek.

扶好栏杆 闭上眼睛 不要偷看

-I'm not.

我没偷看

-Hold on. Hold on.

等一下

To peek is to look at something briefly or to look at someone or something secretly especially from a hidden place.

to peek表示 一扫而过某物/偷瞄某人或某物

Jack here simply doesn't want her to open her eyes just at that moment.

电影表达的是 在那一刻 杰克不想露丝睁开眼睛 想给她一个惊喜

-Did you fly in an airplane today?

你今天坐飞机了吗

-Yes, I did.

是的

-No peeking.

不要偷看

-Did we pot roast for dinner tonight?

我们今晚吃红烧牛肉了吗

-Yes.

吃了

Then although the phrases hold on to and hold on look similar, they mean different things.

虽然 hold on to和hold on看起来很相似 但它们意思却截然不同

When you hold on to something, you make your hold or grip tighter so that you do not drop it or do not fall.

hold on to something说的是 你紧紧的抓住某物 为了不让自己掉下来或摔下来

As they're on the edge of the ship, she needs to hold on to the railing so she doesn't fall.

男女主角都站在船的边缘 所以她需要扶好栏杆 以免摔下去

On the other hand, hold on by itself is simply a phrasal verb that means wait.

而hold on则表示"等待"

Example.

举个例子

-I will help you once I get off of the phone.

-等一下 我等会挂电话了就来帮你

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