using all one's resources; complete; total: an all-out effort.

1905–10; adj. use of all out utterly, completely, Middle English al out

unstinting, exhaustive, unremitting. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  using one's maximum powers: an all-out effort
2.  to one's maximum effort or capacity: he went all out on the home stretch

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
He's an incredible president who for the first time has declared all-out war on
  the guerrillas.
The immune system then kicks in, and the body and the virus wage all-out war.
Newspapers were mildly concerned about falling circulation rather than in an
  all-out panic about imminent collapse.
It's an all-out commitment to keeping our promises to the seniors and the sick.
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