(physics) any of a series of dark lines in the solar spectrum; due to the absorption of light by atoms and molecules in the Sun's atmosphere

(chiefly Forteana) A supposed alignment of ancient sacred sites, such as megalith structures, along straight lines of mystical power.

Alternative spelling of chatline

The edge of the habitat at which trees are capable of growing; the timberline.

(accounting) Total sales or revenue.

(military) A flag on the edge of a minefield. / (linguistics) The line connecting individual letters in Devanagari.

(idiomatic) To set a boundary, rule, or limit, especially on what one will tolerate.

Alternative spelling of guyline

A cord with a weight attached, used to produce a vertical line; a plummet. / Any vertical reference line.

(idiomatic) To abide by the rules or conventions. / (idiomatic) To stand at one's mark before a footrace.