Etymology
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rampant (adj.)

c. 1300, raumpaunt, "standing on the hind legs" (as a heraldic lion often does), thus, also, "fierce, ravenous" (late 14c.), from Old French rampant, rampans, present participle of ramper "to climb, scale, mount" (see ramp (v.)). Sense of "growing without check" (in running rampant), is recorded by 1610s, probably is via the notion of "fierce disposition" or else preserves the older French sense. Related: Rampantly.

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Definitions of rampant

rampant (adj.)
rearing on left hind leg with forelegs elevated and head usually in profile;
a lion rampant
Synonyms: rearing
rampant (adj.)
unrestrained and violent;
rampant aggression
rampant (adj.)
(of a plant) having a lush and unchecked growth;
a rampant growth of weeds
From wordnet.princeton.edu