A (notional) line marking the bottom of the main body of lower-case letters in a line of text.
2The lowest or bottom line of type; an area at the bottom of a page.
The lead-line or lower line of a fishing net or seine.
(a) A bolt-rope sewn to the lower edge of a sail. (b) A rope attached to a yard on which a sailor stands when furling or reefing.
Mid 17th century (in an earlier sense). From foot + line.