Trigger/spark off something
Riots, sparked off by the arrest of seven student leaders, have spread to other universities.
Precipitate
The 1929 stock market crash precipitated the collapse of the American banking system.
Both countries claimed the same area, precipitating a border war.
4.
to be the first or basic cause of something
Be at the root/bottom of
Simple greed is at the root of most white-collar crime.
At the bottom of the country's economic problems is its overwhelming debt.
Lie at the root/bottom of something
Difficulties with the company's overseas subsidiaries lie at the root of last year's losses.
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