"Let's make a deal," a friend might say to you. That means he wants to make an agreement on something. If you pay for the gas, for example, he'll pay for the food. What a deal!
Ready to deal with all the meanings of the word deal?! You can deal a deck of cards. You can make a business deal. You can strike a deal. You can try to deal with an unfortunate situation. You can score a deal in the bargain basement. Deal comes from the Old English dǣlan, meaning "divide" and "participate."