impetus

It’s the impetus for the entire drama that unfolds in this film, and it feels genuinely risky — a taboo that will be hard for this film to resolve.

England have also developed a habit of giving up the impetus just after they have seized it.

Officials say the state visit created an impetus for both sides in recent months to chivvy commercial deals along so both sides had wins they could announce to their domestic audiences during the visit.

A ban on social media was the impetus for the protests, but anger against government corruption had been building in recent weeks.

I don’t think that I want to take eight bars of so and so’s song and throw them into mine, but the impetus, or the feeling of their song, triggered something in me.