Real Dictionary

line
The lines on someone's skin, especially on their face, are long thin marks that appear there as they grow older.
countable noun: A line is a long thin mark which is drawn or painted on a surface.
countable noun: A line of people or things is a number of them arranged one behind the other or side by side.

line in American English 1
a cord, rope, wire, string, or the like
noun: a mark or stroke long in proportion to its breadth, made with a pen, pencil, tool, etc., on a surface

line in American English 2
to put a layer or lining of a different material on the inside of
transitive verb: to cover the inner side or surface of

line in British English 1
noun: a narrow continuous mark, as one made by a pencil, pen, or brush across a surface

line in British English 2
to attach an inside covering to (a garment, curtain, etc), as for protection, to hide the seaming, or so that it should hang well

line in Electrical Engineering
noun: A line is a conducting wire, cable, or circuit for making connections between pieces of electrical apparatus, such as a cable for electric power transmission or telecommunications.

line in Hospitality
noun: A line of people is a number of them that are waiting one behind another, for example, in order to check in to a hotel.

line in Insurance
noun: A line is the amount of a risk that an underwriter is prepared to accept.

line in Retail
noun: A line is one kind of product that a company makes or sells.