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What's when it's at home?

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What's something when it's at home?

  (British & Australian informal) also Who's somebody when he's/she's at home? (British & Australian informal)

something that you say when you want to know what something is or who someone is Feng shui? What's that when it's at home? Who's Mariella Frostrup when she's at home?

See bring home the bacon, be nothing much to write home about, bring home to, keep the home fires burning, play away from home