(shipbuilding) the outline of a horizontal section of a vessel, as when floating in the water.

(idiomatic) To overstep a boundary, rule, or limit; to go too far or do something unacceptable. / To finish a race. / To achieve completion of something. / To cross the equator, as a vessel at sea.

A straight line along which an observer has a clear view. / (weaponry) The line which passes through the front and rear sight, at any elevation, when they are sighted at an object.

(mathematics) A logarithmic line on a Gunter's scale, which is used to perform the multiplication and division of numbers mechanically with only dividers.

(geomorphology) A geomorphologic unconformity marking a boundary between an upland region and a plane; sometimes marked by a series of waterfalls on rivers that cross it.

(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

Alternative form of lashline

(mathematics) The line containing the locus of points from which the segments respectively tangent to two given circles have equal length.