E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A waste-basket; a place where things are stowed, too good to destroy but not good enough to use. In School theology unbaptised infants and good heathens go to Limbo. (Latin, limbus, the edge.) They cannot go to heaven, because they are not baptised, and they cannot go to the place of torment, because they have not committed
sin at all, or because their good preponderates. (See Milton: Paradise Lost, bk. iii.) (See ARAF.)