So there’s no reason to sit on the sidelines tapping your foot.

你没理由翘着二郎腿坐着观望。

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If you sit on the sidelines for any reason, you could be viewed as a Grinch.

如果你只是找理由当旁观者，别人可能会把你看作扫兴的家伙。

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Faced with runaway unicorn valuations, many opted to sit on the sidelines or target smaller deals.

面对失控的独角兽估值，很多人选择持币观望或交易规模较小的目标。

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Mr. McInerney says that this is not the time to sit on the sidelines.

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Of course, Ahmadinejad is not likely sit on the sidelines after he leaves office.

NPR: Next Iran President Likely To Have Gentler Touch

It would have been easier to "sit on the sidelines and take pot shots", she said.

BBC: Kirsty Williams