Meaning

adjective unrestrained and violent

adjective rearing on left hind leg with forelegs elevated and head usually in profile

adjective (of a plant) having a lush and unchecked growth

originFrom Middle English rampand, rampend, present participle of rampen (“to rise by climbing, shoot up, sprout, sty, ascend”), from Old French ramper (“to creep, climb”) (see below), equivalent to ramp + -and or ramp + -ant. Recorded since 1382, "standing on the hind legs" (as in heraldry), later, "fierce, ravenous" (1387). Compare Scots rampand (“rampant”). Alternatively from Middle English…

Etymology from Wiktionary, CC BY-SA 3.0