# throughline

> English word · Noun · IPA /ˈθɹuːlaɪn/

## Definitions
1. In full through line of action: a theme that runs through the plot of a book, film, or other narrative work, or a series of such related works.
2. A railway route that passengers can take without needing to change trains.

## Etymology
From through (“passing from one side of something to the other”, adjective) + line. Compare Middle English thurghline (“a brail or buntline”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/throughline