To cover with stubble or to make stubbly; to cause something to have a rough, prickly appearance like stubble.
From 'be-' (intensive prefix) + 'stubble' (short, stiff hairs remaining after shaving, or crop stalks). The verb form suggests thoroughly covering with or becoming stubbly.
This is a brilliant example of how English can verb almost anything—'bestubble' takes a noun (stubble) and makes it an action. It's the kind of word a novelist might use to describe someone's unshaven jaw or a field of harvested grain.
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