\Couth\ (k??th), imp. & p. p. of {Can}. [See {Can}, and
cf. {Uncouth}.]
Could; was able; knew or known; understood. [Obs.]

      Above all other one Daniel He loveth, for he couth well
      Divine, that none other couth; To him were all thing
      couth, As he had it of God's grace.      --Gower.