late 14c. (late 13c. as a surname), collere "charcoal maker and seller," agent noun from Middle English col (see coal). They were notorious for cheating their customers. Meaning "digger in a coal mine" is from 1590s. Sense of "coasting-vessel for hauling coal" is from 1620s.
1961, abbreviation of mini-car, a small car made by British Leyland (formerly British Motor Corp.). As an abbreviation of miniskirt, it is attested from 1966.
"ancient two-wheeled vehicle used in war, racing, and private life," mid-14c., from Old French charriot "wagon" (13c.), augmentative of char "car," from Late Latin carrum "chariot" (see car).