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A cluster of dust and dirt. It is typically associated with things that have not been recently cleaned or used. When was last time you swept in here? There are massive dust bunnies behind the couch! Ever since the accident, Jamie's poor, neglected guitar has been just sitting in the corner, collecting dust bunnies.
dust bunnyand a dust kitten; a turkey's nest
Kg. a clump of dust and lint. She swept the dust bunnies out from under the bed. There's a huge dust kitten behind the chiffarobe. He hasn't cleaned in weeks. There are turkey's nests in every corner.