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

The rule applies to players, coaches and officials on the sidelines during matches.

From Los Angeles Times • Jun. 8, 2026

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

High mortgage rates, job-market uncertainty and the rising cost of living have kept many prospective buyers on the sidelines.

From The Wall Street Journal • Jun. 2, 2026

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

From BBC • May 26, 2026

I was already leaning toward some type of political involvement, but I did not know what or how, and I lingered on the sidelines, uncertain what to do.

From "Long Walk to Freedom" by Nelson Mandela