Definition of all-out
(Entry 1 of 2)
1
: made with maximum effort : thoroughgoing
an all-out effort to win the contest
all out
adverbDefinition of all out (Entry 2 of 2)
: with full determination or enthusiasm : with maximum effort
—used chiefly in the phrase go all out
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Merriam-Webster unabridged
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Time Traveler for all-out
The first known use of all-out was in 1840
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