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From The Collaborative International Dictionary of English v.0.48:
Grub \Grub\ (gr[u^]b), v. i. [imp. & p. p. Grubbed (gr[u^]bd), p. pr. & vb. n. Grubbing.] [OE. grubbin., cf. E. grab, grope.] 1. To dig in or under the ground, generally for an object that is difficult to reach or extricate; to be occupied in digging. [1913 Webster] 2. To drudge; to do menial work. --Richardson. [1913 Webster]