How to Tell the Difference Between Borrow and Lend
Use lend when you are giving money or items to someone.
Use borrow when you are taking money or items from someone (or funds from a bank!).
Try to use "lend me" in place of "loan me". The loan is the noun for the amount that you have borrowed and using it in the phrase "loan me" is not accurate, no matter how often you hear it!