1
as in sheer
having no exceptions or restrictions
Grandpa got the all-out support of the family when he decided to remarry at age 72
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2
as in thorough
trying all possibilities
an all-out effort to break open the door
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as in full steam ahead
with all power or resources being used
went all out for her New Year's Eve party—she even had fireworks!
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Merriam-Webster unabridged
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