E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Proclaim on the Housetop.
To proclaim or make known to everyone; to blab in public. Dr. Jahn says that the ancient Jews ascended their roofs to announce anything to the multitude, to pray to God, and to perform sacrifices (Matt. x. 27).
No secret can escape being proclaimed from the housetop.London Review.