slot means

If you’re seeing this message in TWRP, this usually means that, one way or another, you have wiped your system partition. How you can fix this issue depends ...

Định nghĩa let it slide It basically means to allow something to be ignored or easily overlooked. Examples: "After mom died, dad let the buisness slide a little." "She rejected you?

Định nghĩa how do you spell that? To spell means that you name the letters in a word. (For example: S-p-e-l-l) Back to your question, it's asking how to write that word.