This is the 5109th most frequent Japanese word.
貸し
"貸し" means "loan" or "favor."
Here, '貸し' (as '貸して') is used in the context of lending books, illustrating its usage for borrowing in a library.
彼の図書館から本を貸してもらいました。
I borrowed a book from his library.
In this sentence, '貸し' implies a 'favor' or something that is owed, demonstrating how the term can extend to conceptual loans like obligations or favors.
彼に大きな貸しがあるから、彼は助けてくれるはずだ。
He owes me a big favor, so he should help me.
'貸し' (as '貸しています') indicates the act of renting out a room to someone, showing its application in property or space rental contexts.