What's the noun for traplines? Here's the word you're looking for.
trap
A machine or other device designed to catch (and sometimes kill) animals, either by holding them in a container, or by catching hold of part of the body.
A trick or arrangement designed to catch someone in a more general sense; a snare.
A wooden instrument shaped somewhat like a shoe, used in the game of trapball
The game of trapball itself.
Any device used to hold and suddenly release an object.
A bend, sag, or other device in a waste-pipe arranged so that the liquid contents form a seal which prevents the escape of noxious gases, but permits the flow of liquids.
A place in a water pipe, pump, etc., where air accumulates for want of an outlet.
(historical) A light two-wheeled carriage with springs.
(US, slang, informal, African American Vernacular) A vehicle, residential building, or sidewalk corner where drugs are manufactured, packaged, or sold. (Also used attributively to describe things which are used for the sale of drugs, e.g. "a trap phone", "a trap car".)
(offensive) A fictional character from anime, or related media, whose character design or voice actor is coded to a different gender than their textual one.