rampant

1. (originally) Rearing on both hind legs with the forelegs extended.Examples: "The Vienna riding school displays splendid rampant movement."

2. (heraldry) Rearing up, especially on its hind leg(s), with a foreleg raised and in profile.Examples: "‘I forget your coat of arms.’ ‘A human foot d’or, in a field azure; the foot crushes a serpent rampant whose fangs are imbedded in the heel.’"; "little pieces of moustache on his upper lip, like a pair of minnows rampant"; "The crest consists of a demi-lion rampant gules (red) holding between its paws a wheel argent similar to those included in the arms."

3. (architecture) Tilted, said of an arch with one side higher than the other, or a vault whose two abutments are located on an inclined plane.