木已成舟

1.The wood is already made into a boat -- too late to change.; come to stay; The die is cast.; That's water over the dam -- something that happened in the past and cannot be changed.; The fat is in the fire.; The thing was settled and couldn't be altered.; There is no use crying over the spilt milk; Things past cannot be recalled.; water under the bridge; What's done can't be undone.; What's done is done.