Alternative spelling of 混沌 (“chaotic”)

cloakroom

(historical) The inner chamber (inner quarters) of the Edo Castle where the shōgun's consort, concubines, and ladies in waiting resided. Other than the shōgun, no other men were permitted entrance....

to fall / (computing) to go down (as when a computer or application becomes unresponsive) / (electrical engineering, of a circuit breaker) to trip / (informal) to fail an examination