Stable-door.
Locking the stable-door after the horse [or steed] is stolen. Taking precautions after the mischief is done.
Locking the stable-door after the horse [or steed] is stolen. Taking precautions after the mischief is done.
Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.