"the outline of a shore or coast," 1819, from coast (n.) + line (n.).

also waist-line, 1867, from waist + line (n.).

"final result, central or salient point," 1832, a figurative use from profit-and-loss accounting, where the final figure calculated is the bottom line on the page. Also (especially as an adjective) bottom-line, bottomline.

"punchline of a joke," 1926, originally "last line in an actor's speech" (1916), from tag (n.1) + line (n.).

also neck-line, "shape of the top of a woman's garment at the front," 1900, from neck (n.) + line (n.).

also shore-line, "line where the shore and the water meet," by 1839 in the geographical sense, from shore (n.) + line (n.).

"person who fits a lining to," 1610s, agent noun from line (v.1). The meaning "thing serving as a lining" is from 1869. Liner notes in a record album is attested from 1953.

also slim-line, "gracefully, stylishly thin," 1949, of fashions, household appliances, etc., from slim (adj.) + line (n.).

also on-line, in reference to computers, "directly connected to a peripheral device," 1950; see on + line (n.).

1960, in typography, "subhead above the main head," from strap (n.) + line (n.). In reference to a woman's undergarments, by 1973.