E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The wrong side of the blanket. A love-child is said to come of the wrong side of the blanket.
He grew up to be a fine waule fallow, like mony ane that comes o the wrang side o the blanket.Sir W. Scott: The Antiquary, chap. xxiv.
A wet blanket. A discouragement, a marplot. A person is a wet blanket who discourages a proposed scheme. Treated with a wet blanket, discouraged. A wet blanket influence, etc. A wet blanket is used to smother fire, or to prevent one escaping from a fire from being burnt.