verb (used with object), imperiled, imperiling or (especially British) imperilled, imperilling.
to put in peril or danger; endanger.

1590–1600; im-1 + peril

imperilment, noun

risk, jeopardize, hazard, chance. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
imperil (ɪmˈpɛrɪl)
vb , or (US) -rils, -rilling, -rilled, -rils, -riling, -riled
(tr) to place in danger or jeopardy; endanger

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Narwhals may be imperiled because of their genetic homogeneity, limited diet
  and fixed migration patterns.
But getting timely and accurate information to imperiled communities is
Until the market recovers, the entire recovery is imperiled.
But these gains are imperiled by the current stalemate at the top.
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