Definitions for jaws of life
Random House Webster's College Dictionary
Jaws′ of Life′*
a heavy-duty tool that can cut through metal or pry apart sections of it: used esp. to free people trapped in wrecked vehicles.
Category: Machinery, Trademark
Jaws of Life(noun)
hydraulic tool inserted into a wrecked vehicle and used to pry the wreckage apart in order to provide access to people trapped inside
jaws of life(Noun)
Emergency rescue equipment used to open a completely destroyed passenger vehicle, to quickly and somewhat safely extricate the trapped occupants.
Origin: jaws+of+life. By analogy with an actual jaw and the fact that this mechanical device allows the possibility of preserving the life of the victim being rescued.
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"jaws of life." Definitions.net. STANDS4 LLC, 2013. Web. 5 Dec. 2013. <http://www.definitions.net/definition/jaws of life>.