“crack somebody up”
When you say”creak him up“，whatdo you mean？
Re: “crack somebody up”
If something cracks you up, it makes you laugh uncontrollably. Here's a excerpt from a popular British science-fiction TV series:
Doctor: ...I've got to say, I'm such a fan.
Charles Dickens: You're... what?
Doctor: A fan. Your number one fan, that's me.
Charles Dickens: How are you a fan? In what way do you resemble a means of keeping oneself cool?
Doctor: No, no, it means fanatic, devoted. Although, I've got to say, that American bit in Martin Chuzzlewit, what was that all about? Padding or what? I mean, rubbish, that bit.
Charles Dickens: I thought you said you were my... fan.
Doctor: Oh, well, if you can't take criticism... Hey, go on, do the death of Little Nell! Cracks me up every time!
Charles Dickens: [looks horrified]
Doctor: Er, no, forget that...
Dickens is horrified when the Doctor says that the death of Little Nell cracks him up -- makes him laugh -- because it is one of the saddest things Dickens ever wrote.
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