Wintersoulstice

Dunno where OP is from but in French, borrow and lend are the same word. you just have to pay attention to how you phrase it, so this is a pretty common mistranslation for that language

Ok, so this was on an episode of some medical show (greys anatomy? House?) where the doctors got angry with a couple when they realized that BOTH of them, not just one as previously thought, had CF. They were reprimanding the two of them pretty severely. Can you elaborate on why this is a big no-no? When I searched Google to try to understand the dynamic, I didn't really get much of a detailed answer. You can catch each other's lung infections?

Yes, sorry I guess that was super straightforward!