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

“We do not want to wait on the sidelines, but actively contribute to making synthetic fuels market-ready and scalable,” said Jens Fehlinger, the airline’s chief executive.

From The Wall Street Journal • Jun. 2, 2026

But that may just keep the Fed on the sidelines.

From Barron's • May 29, 2026

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

From BBC • May 26, 2026

“Do you mind if you only play on the sidelines, Robert?”

From "Ugly" by Robert Hoge