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I guess fat chance is said sarcastically.
If you’re up for something, or down for something, it means the same thing.
If you fill in a form or fill out a form, it means the same thing.
English is fucked.
Think about filling in a form, though. Filling in a form—“to fill” is unambiguous. In/out isn’t even necessary when you think about it. “I’m going to fill a form” means the same thing too.