run rampant

:  to go faster than a walk

:  to go steadily by springing steps so that both feet leave the ground for an instant in each step

:  to move at a fast gallop

:  an act or the action of running :  continued rapid movement

:  a quickened gallop

:  a migration of fish (as up or down a river) especially to spawn

:  being in a melted state

:  made from molten material :  cast in a mold

:  having made a migration or spawning run

:  rearing upon the hind legs with forelegs extended

:  marked by a menacing wildness, extravagance, or absence of restraint

:  profusely widespread