E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The 14th Foot. Called Calvert from their colonel, Sir Harry Calvert (18061826), and entire, because three entire battalions were kept up for the good of Sir Harry, when adjutant-general. The term is, of course, a play on Calverts malt liquor. The regiment is now called The Prince of Waless Own (West Yorks. Regiment).