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  1. pond scum

    • n.
      a mass of algae forming a green film on the surface of stagnant water.;a worthless or contemptible person or group of people.
    • noun: pond scum

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    • IPA[ˈpänd ˌskəm]

    美式

    • n.
      a mass of algae forming a green film on the surface of stagnant water.

    Oxford American Dictionary