n. a kind of margin in the head of a newspaper where the name of the author is written

To set someone up(Toronto)

Although one of the least common definitions, a "line" can also mean 1 fluid oz of codeine cough syrup. For example, some people who sell the stuff will sell it by the "line" for anywhere from like 30-100 dollars.

Set someone up, plot against, conspire against one.

in a position of risk or vulnerability.

An imaginary line, that which loud managers insist you bring product forward to on the shelf.

A 'line'(for lack of better word) of any powdered drug that is snorted, often through a rolled up 100 dollar bill.