1. A small area of deep or shallow water; such as, a fishpond or a puddle, etc.: Deer often come to drink at the pools near the forest.

Tracy dived into the swimming pool in her back yard for her exercise.
2. A small amount of liquid which is on a surface: The police found the man's dead body on the floor in a pool of blood.
3. A focus of light or an illumination on a small flat surface: When the sun came up, Shelby could see people standing in pools of light.
4. Money which is bet by an individual or a group of people on an event; such as, sports, or some other competitive activity: Who won the football pool this week?

Well, it seems that Bill lucked out and won this week's football pool.

5. An association, group, or coalition of people: Mildred was employed as a member of the typing pool.

The high gas prices made Frank decide to join the car pool in order to save money.

1. To merge, to combine, or to band together: Eric and Carla pooled their resources and they got the job done much faster.

The students were convinced that they could accomplish their project faster if they pooled their ideas and research materials.

2. To combine something to form a supply which can be used by a group: The two couples pooled their money and rented a car for the trip.

An outdoor swimming pool having an edge over which water flows into a trough but seems to flow to the horizon.