on the sidelines

Idioms  

1. Observing rather than taking part, out of the action, as in Bolivia's neighbors remained on the sidelines, waiting to see which faction in the dispute would prevail. This idiom comes from sports. The sidelines are the two lines defining the sides of the court or playing field and the area immediately beyond them where, in such sports as football, the non-playing team members sit. [First half of 1900s]

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Example Sentences

While, for now, he will sit on the sidelines, Damodaran says he would reconsider that posture if the stock drops enough.

From MarketWatch • Jun. 5, 2026

“Poor affordability is keeping buyers on the sidelines while higher rates make homeowners hesitant to sell outside of demographics and necessity,” TD Bank U.S.

From Barron's • May 26, 2026

Others, like Italy, argue that it's unwise to stay on the sidelines any longer.

From BBC • May 26, 2026

Rival studios largely stayed on the sidelines, with no other potential blockbuster debuting at the same time.

From Los Angeles Times • May 24, 2026

I swear to God, when I played, sometimes I would see Joey out there leading the back line, but it was always someone else.During our game, I could hear Doc Dad on the sidelines, cheering.

From "Winger" by Andrew Smith