pot·luck /ˈpɑtˈlʌk, ||ˌlʌk/
 家常便飯


 Pot·luck n. Whatever may chance to be in the pot, or may be provided for a meal.
    A woman whose potluck was always to be relied on.   --G. Eliot.
 To take potluck, to take what food may chance to be provided.

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 potluck
      n : whatever happens to be available especially when offered to
          an unexpected guest or when brought by guests and shared
          by all; "having arrived unannounced we had to take
          potluck"; "a potluck supper"