Grubble

v. t. [Diminutive of grub, or a modification of grabble. Cf. O. H. Ger. grubilôn, M. H. Ger. grübelen, N. H. Ger. grübeln, to grub, dig.] To feel or grab in the dark. [Obs.] Dryden.

v. i. To grovel. [Obs.] Hopkins.