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life sentence
life-size
life span
life span psychology
life story
life-support
life-support system
life table
life-threatening
life vest
life zone
lifeblood
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life-threatening
life-threat·en·ing


adjective 
Definition:
 
very serious: very dangerous or serious with the possibility of death as an outcome
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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