E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Commandment.
The eleventh commandment. Thou shalt not be found out.
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“After all, that Eleventh Commandment is the only one that is vitally important to keep in these days.”—B. H. Buxton: Jennie of the Prince’s, iii. 314.
The ten commandments. The ten fingers or nails. (Shakespeare: 2 Henry VI., i. 3.)
