wholeheartedly enthusiastic and loyal; eager; zealous: a gung-ho military outfit.
adverb
2.
in a successful manner: The business is going gung-ho.
Origin: introduced as a training slogan in 1942 by U.S. Marine officer Evans F. Carlson (1896–1947) < Chinesegōng hé, the abbreviated name of the Chinese Industrial Cooperative Society, taken by a literal translation as “work together”
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
the offspring of a zebra and a donkey.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
mod. zealous; enthusiastic. : We're really gung-ho about the possibilities of this product.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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