脱缰

to throw off the reins / runaway (horse) / fig. out of control

to shed / to take off / to escape / to get away from

variant of 韁|缰[jiang1]

bridle / reins / halter

lit. a horse that has thrown off the reins (idiom); runaway horse / out of control

a wild horse that refuses to be bridled (a metaphor for sth that runs wild)