# sideline

> English word · Noun · IPA /ˈsaɪdlaɪn/ · frequency rank #19,204

## Definitions
1. A line at the side of something.
2. Something that is additional or extra or that exists around the edges or margins of a main item.
3. A line for hobbling an animal by connecting the fore and the hind feet of the same side.
4. A line defining the side boundary of a playing field. Used in Canadian football, field lacrosse and basketball.
5. The area outside the playing field beyond each sideline.
6. The outside or perimeter of any activity.
7. A secondary road, especially a byroad at right angles to a main road.
8. A side hustle.

## Etymology
From side + line.

## Easily confused with
- **sidelines** (https://plainspell.com/en/vs/sideline-vs-sidelines)

## Common misspellings (11)
`isdeline`, `sdieline`, `siddeline`, `sideilne`, `sidelien`, `sidelinne`, `sidelline`, `sidelnie`, `sidleine`, `siedline`, `ssideline`

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