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older, worn-out clothes, esp. worn for dirty activities; also written grubbers , grubs
Please wear grubbies when gardening.
"dirty," by 1845, from grub (n.) in a sense of "dirty child" (who presumably got that way from digging in earth) + -y (2). Earlier it was used in a sense of "stunted, dwarfish" (1610s) and "infested with grubs" (1725). Related: Grubbily; grubbiness.
Older, worn-out clothes, esp worn for hanging out or doing dirty work: Wear grubbies for the archaeology dig
Not clean; dirty: grubby kid