"ship belonging to a shipping line," 1838, from line
(n.) on notion of a succession of ships plying between ports along regular "lines." Line
in this sense first attested 1786 in ref. to stagecoaches. Meaning "cosmetic" first recorded 1926, short for eye-liner
. The type of baseball hit was so called since 1874. Liner notes
in a record album are attested from 1953.