verb.
To put into peril; to place in danger or cause a hazard.
verb.
To risk.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
verb.
pose a threat to; present a danger to
Word Usage
"Those who supported the Bush invasion and military occupation of Iraq are back at it, warning that President Obama could "imperil" Iraq if he keeps his campaign promise to remove US combat forces within 16 months."