1
a
: rearing upon the hind legs with forelegs extended
b
: standing on one hind foot with one foreleg raised above the other and the head in profile
—used of a heraldic animal
2
a
: marked by a menacing wildness, extravagance, or absence of restraint
rampant rumors
b
: profusely widespread
rampant weeds
rampantly
adverb
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Merriam-Webster unabridged
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