burn-out

burnout

[burn-out]
noun
1.
a fire that is totally destructive of something.
2.
Also, burn-out. fatigue, frustration, or apathy resulting from prolonged stress, overwork, or intense activity.
3.
Rocketry.
a.
the termination of effective combustion in a rocket engine, due to exhaustion of propellant.
b.
the end of the powered portion of a rocket's flight.
4.
Electricity. the breakdown of a lamp, motor, or other electrical device due to the heat created by the current flowing through it.

Origin:
1900–05; noun use of verb phrase burn out

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

burnout
"drug user," early 1970s slang, from burn + out. Meaning "mental exhaustion from continuous effort" is from 1975.
Online Etymology Dictionary, © 2010 Douglas Harper
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