The Collaborative International Dictionary
Grubble
Grubble \Grub"ble\, v. t. & i. [Freq. of grub, but cf. grabble.]
To feel or grope in the dark. [Obs.]
--Dryden.
Wiktionary
grubble
vb. (context obsolete English) To feel or grope in the dark.
Usage examples of "grubble".
The little Grubbling house in Budd Street was peopled all through, in every corner, with her fancies.
I knew Mr. Grubble very well by sight, from his often standing at his door.