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Douglas Harper's Etymology Dictionary
car-pool

also carpool, 1942, American English, from car + pool (n.2). As a verb from 1962. Related: Carpooled; carpooling.

Usage examples of "car-pool".

We can car-pool and avoid all the traffic snarls on the Infommercial Superhighway where apologists for fat headed films clog the pathways of perception.