E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Walton.
An Izaak Walton. One devoted to the gentle craft of angling. Izaak Walton wrote a book called The Complete Angler, or Contemplative Mans Recreation. (1655.)
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Gentle is a pun. Gentles are the larvæ of flesh-flies used as bait in angling.