Sc. and north. dial. Also α. 7 Jock the Leg, 8 jocte-, jactaleg, 9 jockta-, joktaleg, jock-to-, jock-tae-leg. β. 89 jacklag, jack-o-legs, 9 jacka-, jacki-, jackylegs, jocka-, jocke-, jockylegs. [The α forms are Sc., and the original; the β forms are Engl. dial. See Note below.] A (large) clasp knife.
α. 1672. Acc. Bk. Sir J. Foulis (1894), 6. For a Jock the Leg Knife 00l. 08s. 0d. Scots.
1722. Ramsay, Twa Cutpurses. Sma gimcracks that pleasd their nodles Sic as a joctaleg, or sheers.
1785. Burns, Halloween, v. An gif the custocks sweet or sour, Wi joctelegs they taste them. Ibid. (1789), Peregrin. Capt. Grose, viii. It was a faulding jocteleg, or lang-kail gullie.
1818. Scott, Rob Roy, xxxii. After John Highlandmans sneckit this ane wi his joctaleg.
1833. Frasers Mag., Oct., 398. In a hole he had jock-to-legs, keelavine-pens or whatever else he could purloin.
1885. Jas. Grant, Royal Highlanders (Rtldg.), 229. A large knifelike the genuine jockteleg of the days of old.
β. 1777. Horæ Subsecivæ, 227 (E. D. D.). Jack-lag-knife.
1787. Grose, Prov. Gloss Jack-o-legs, a clasp knife. (North.)
1822. Bewick, Mem., 26. I involuntarily got my Jackleg knife.
1825. Brockett, Jackalegs, Jockelegs, a large clasped knife.
184778. Halliwell, Jack-lag-knife, a clasped knife. Glouc.
[Note. Lord Hailes, Spec. Sc. Gloss. (c. 1776) 18, says The etymology of this word remained unknown till not many years ago an old knife was found having this inscription Jacques de Liege, the name of the cutler. A similar statement is made by Smiles, Industr. Biog. (1864), 133, and Jevons, Coal Question (1866), 91. The former says Jacques de Liege, a famous foreign cutler whose knives were as well known throughout Europe, as those of Rodgers or Mappin are now. On the face of it this account is plausible: it was not uncommon in Sc. for de to be corrupted to the, e.g., the Bruce; the change of d to t after k is also phonetically simple. But, for the present, Scottish antiquaries have failed to find any confirmation, in knife or document, of Hailess statement; and inquiries made for us at Liege have been equally unsuccessful in finding any trace of Jacques the cutler.]