A toll is a payment made for something. To drive on some highways, drivers have to pay a toll when they exit.
Toll comes from the Greek word for "tax," telos. When a fee is charged for the privilege of driving on a road or crossing a bridge, it's called a toll. Another kind of toll is the charge to make a long distance telephone call. Occasionally, toll refers to a different kind of cost — a loss of human life: the human toll of an earthquake or war. Finally, there's the toll, or deep ringing sound, of a bell.