1. an arrangement for private transportation in which the responsibility of providing an automobile is rotated among members of a group of automobile owners: »
Growing numbers of commuters, as a result, are driving their own cars to work or joining car pools in which members usually take turns in furnishing transportation for fellow commuters (Wall Street Journal).
2. the members of such a group arrangement.
car|pool or car-pool «KAHR POOL», intransitive verb.
to join or take part in a car pool: »
In Houston, Texas, five friends and neighbors car-pool daily to their jobs at Shell Oil Company's headquarters (Woman's Day).
Useful english dictionary. 2012.