bank 1 
(băngk)
(băngk)n.
1. A piled-up mass, as of snow or clouds; a heap: a bank of thunderclouds.
2. A steep natural incline.
3. An artificial embankment.
4. often banks
a. The slope of land adjoining a body of water, especially adjoining a river, lake, or channel.
b. A large elevated area of a sea floor.
5. Games The cushion of a billiard or pool table.
6. The lateral inward tilting, as of a motor vehicle or an aircraft, in turning or negotiating a curve.
v. banked, bank·ing, banks
v.tr.
1. To border or protect with a ridge or embankment.
2. To pile up; amass: banked earth along the wall.
3. To cover (a fire), as with ashes or fresh fuel, to ensure continued low burning.
4. To construct with a slope rising to the outside edge: The turns on the racetrack were steeply banked.
5.
a. To tilt (an aircraft) laterally and inwardly in flight.
b. To tilt (a motor vehicle) laterally and inwardly when negotiating a curve.
6. Games To strike (a billiard ball) so that it rebounds from the cushion of the table.
7. Sports To play (a ball or puck) in such a way as to make it glance off a surface, such as a backboard or wall.
v.intr.
1. To rise in or take the form of a bank.
2. To tilt an aircraft or a motor vehicle laterally when turning.
[Middle English, of Scandinavian origin.]