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.
I guess fat chance is said sarcastically.
I’ve never not heard it said sarcastically.
There are words and phrases in English that get used sarcastically so often they lose their original meaning. There is a word for this and I swear I’ve seen a whole list somewhere but my google fu is weak today.
Semantic satiation?
No - semantic satiation is when you read or hear a word so much in a short timeframe that it stops feeling like a real word, and briefly feels like just a jumble of letters/sounds.
I hate semantic satiation. It happens all the time while programming for me. I’ll have a variable name with some common word and, after typing it a few times my brain just stops recognizing it as a real word. This sometimes sends me into etymology dives to figure out why the word “jump” (or whatever) looks so strange.
