tail-gate (n.)youdaoicibaDictYouDict[tail-gate 词源字典]
1868, back panel on a wagon, hinged to swing down and open, from tail (n.1) + gate (n.). Extended by 1950 to hatchback door on an automobile. The verb (also tailgate) meaning "to drive too close behind another vehicle" is from 1951 ("Truck drivers know the practice of following too close as tail-gating" - "Popular Science," Jan. 1952); as an adjective, in reference to the open tail-gate of a parked car as a setting for a party or picnic, from 1958. Related: Tail-gating.[tail-gate etymology, tail-gate origin, 英语词源]
teamster (n.)youdaoicibaDictYouDict
"person who drives a team of horses" (especially in hauling freight), 1776, from team (n.) + -ster. Transferred to motor truck drivers by 1907.
trucker (n.)youdaoicibaDictYouDict
1853, "worker who moves loads using a cart;" agent noun from truck (v.2). Meaning "person who drives a motorized truck" is by 1935, a shortening of truck driver (1907).