Green’s Dictionary of Slang

barkwell and holdfast n.

[pvb ‘Brag’s a good dog, but Holdfast is better’]

(US) someone who will back their words with deeds; a tough fighter.

[US]W.A. Caruthers Kentuckian in N.Y. I 189: He’s a bark-well and hold-fast too; he doesn’t honey it up to em and mince his words [...] he knocks down and drags out.