noun Also car pool.
- Also car·pool·ing, car pooling. an arrangement among a group of automobile owners by which each owner in turn drives the others or their children to and from a designated place.
- those included in such an arrangement.
verb (used without object)
- Also car-pool. to form or participate in a carpool.
- another term for carshare
also carpool, 1942, American English, from car + pool (n.2). As a verb from 1962. Related: Carpooled; carpooling.