Skains-mate or Skeins-mate

A dagger-comrade; a fencing-school companion; a fellow cut-throat. Skain is an Irish knife, similar to the American bowie-knife. Swift, describing an Irish feast, says, “A cubit at least the length of their skains.” Green, in his Quip for an Upstart Courtier, speaks of “an ill-favoured knave, who wore by his side a skane, like a brewer’s bung-knife.”