Lend and borrow are two verbs that are often confused.

Lend means to give something to somebody for a period of time expecting that they will give it back.

eg: Mary is going to lend me her Chanel dress for the party. (=Mary is going to give me me her Chanel dress for the party, then I am going to give it back to her.)

Borrow means to use something that belongs to someone else and then return it.

eg: I borrowed the book from my sister. (= The book belongs to my sister and I am using it ).