back room

noun
🔊/ˌbæk ˈruːm/, 🔊/ˌbæk ˈrʊm/
🔊/ˌbæk ˈruːm/, 🔊/ˌbæk ˈrʊm/
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  1. a room at the back of a building, away from the entrance, often where secret activities take place后室;密室