mess with

“mess with”常见释义为“招惹、干涉、乱动、吓唬、迷惑、搞”，“mess with something/someone”，它用来表示[被利用或参与危险的事情或人]，"mess with sb"意指使某人生气。

例子1：That jerk just cut off that old lady. - Wanna mess with him? - Mess with who?Is that allowed?（那个混蛋刚刚超了那位婆婆的车，想吓唬他一下吗？吓唬谁？这样合规矩吗？）

例子2：I'm not a bloody LMD! You're messing with me, messing with my head!- It's not me, Jemma! - Well, it's one of us!（我不是生化机器人替身！ 你在扰乱我的思绪！-不是我，珍玛！肯定是我们其中一人！）

例子3：I thought this was gonna be fun. I mess with you, you mess with me,eventually you give in.（我以为会很有趣，你搞我，我搞你，最后，你会投降）

例子4：Shining a light on the way data can mess with people’s heads is fine.（指出数据可能会迷惑人们的思考，这很好。）

crack up

常见释义：（精神上）崩溃，崩溃，让某人大声笑，大笑，开心。“捧腹大笑”就可以用这个词组，代替laugh，更生动一些！

If you crack up or if someone or something cracks you up,you laugh a lot.

例子1：I sure do. How about you, Chris? Cracks me up thatour teacher was in prison last week.（我认为有趣极了，克里斯 你呢？想到我们的老师上周还在坐牢就快把我笑死了。）

例子2：l'll see what l can do. She cracks me up.Well, l can't believe it.（我看我能找到什么，她真让我失控，嗯，我真不敢相信。）

例子3：who've seen combat like he has. They can crack up.See and hear weird things（经历过战斗的飞行员，他们会崩溃出现幻听和幻觉。）

knock it off

knock it off的意思就是used to tell sb to stop making a noise, annoying you, etc.别吵了；别烦人了。它是一种informal的说法。

名词knock-off/knockoff是“山寨、仿制品、赝品”的意思，比如，Joey Zwillinger, Allbirds’ co-founder, grumbles about what he calls the “knock-off” shoes he sees on Amazon.（Allbirds的联合创始人乔伊·茨维林格（Joey Zwillinger）抱怨亚马逊上的这些鞋是“山寨货”。）

例子1：- Litchfield. - Litchfield. Knock it off! Knock it off!We'd like to know, sir.（利菲尔德，利菲尔德，静一下！静一下！我们想知道，先生。）

例子2：Trust me. All right. Knock it off, knock it off.Thank you.（相信我，好了，别闹了，谢谢你。）

例子3：They won't cut glass. Knock-offs?The second Rina sees them, she's gonna know they're fake.（切不了玻璃，假货啊？瑞娜一检验就会知道是假货。）