rampant

hurjistunut, raivoava

rehottava

pystyyn kavahtanut puhekieltä rearing Rearing on both hind legs with the forelegs extended.
The Vienna riding school displays splendid rampant movement.
puhekieltä rearing Rearing up, especially on its hind leg(s), with a foreleg raised and in profile.
1846, (w), The Cask of Amontillado

‘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

In contrast to the despair of his opposite number, it was a day of delight for new City boss Manuel Pellegrini as he watched the rampant Blues make a powerful statement about their Premier League ambitions.