1
: a line at right angles to a goal line or end line and marking a side of a court or field of play for athletic games
2
a
: a line of goods sold in addition to one's principal line
b
: a business or activity pursued in addition to one's regular occupation
3
a
: the space immediately outside the lines along either side of an athletic field or court
b
: a sphere of little or no participation or activity
—usually used in plural
Examples of sideline in a Sentence
Noun
She makes and sells jewelry as a sideline.
Recent Examples on the Web
Mike Darnay, CBS News, 13 Jan. 2026
Kittle was carted off the field, indicating a serious injury, after he was tackled by safety Marcus Epps at the right sideline.
—Chris Biderman, Sacbee.com, 12 Jan. 2026
Kirk Kenney, San Diego Union-Tribune, 13 Jan. 2026
The Blazers, though, will look a little different Tuesday with Avdija suffering a back injury Sunday that will sideline him.
—Joseph Dycus, Mercury News, 13 Jan. 2026
See All Example Sentences for sideline
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Noun
Joe Buck will be on the call for play-by-play with analysis from Troy Aikman and sideline reporting from Lisa Salters.
—Verb
Schauffele missed the Farmers last year while recovering from a rib injury that sidelined him for two months.
—Cite this Entry
“Sideline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sideline. Accessed 19 Jan. 2026.
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