Green’s Dictionary of Slang

Jis n.

In exclamations

by Jis! (also by Gis! by Gys!)

a mild oath, a euph. for ‘by Jesus!’.

[UK]Hickscorner Bi: Put up your blade Shethe your whyttell or by Jyz it was neuer borne.
[UK]Roy & Barlow Rede me and be nott wrothe (1895) 56: They regarde it no more be gisse Then waggynge of his mules tayle.
[UK]J. Heywood Pardoner and Friar Biii: Leue thy railynge and babbelynge of freres / Or by Jys Ish lug thee by the swete eares.
[UK]T. Chaloner (trans.) Erasmus on Folly Qiib: as scant they can eate theyr meate, or byde a minute without theim, cherishyng them (by iysse) a little better than they are wont to dooe these frounyng philosophers .
[UK]T. Ingelend Disobedient Child Fi: By gys, I sweare, thou brutyshe Beaste.
J. Heywood Proverbs and Epigrams (1867) 112: Ich can not one woord of it by Iis. Iack is nere his wit, by gis.
[UK]Tyde taryeth no Man in Collier (1863) II 41: It setteth my teeth an edge, by gisse.
[UK]Misogonus in Farmer (1906) II iv: oenoph: I’ve been for you[r] man o’ th’ church, and wot you where I had him? I’ th’ alehouse at whipperginny, as close as a burr. [...] orgal: Did I not tell you? I would he were unpriested, by Jis.
[UK]Lyly Euphues and his England (1916) 214: By Gis, son I account the cheer good which maintaineth health.
[UK]Maroccus Extaticus C: Of more amisse by gis, than easily amended is, of bauderie and beggarie, and such lyke matters.
[UK]Shakespeare Hamlet IV v: By Gis, and by Saint Charity, Alack, and fie for shame!
[UK]‘Du Parc’ (trans.) Comical Hist. of Francion Bk vii 6: A hundred times and more, by Gis, I would have laid Pyebald against the best Mare.