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n. also car pool
1. An arrangement whereby several participants or their children travel together in one vehicle, the participants sharing the costs and often taking turns as the driver.
2. A group, as of commuters or parents, participating in a carpool.
v. also car-pool car·pooled, car·pool·ing, car·pools
To travel in a carpool.
To transport by means of a carpool: carpool the children to school.