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  1. Oxford Dictionary

    tack coat

    • n.
      (in road-making) a thin coating of tar or asphalt applied before a road is laid to form an adhesive bond.

    • noun: tack coat, plural noun: tack coats

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    tack coat

    • IPA[tak kōt]
    • n.
      (in roadmaking) a thin coating of tar or asphalt applied before a road is paved to form an ...

    Oxford American Dictionary