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noun un·der·coat \-ˌkōt\

Simple Definition of undercoat

  • : a coat of paint that is put on a surface to prepare it for another coat of paint

Source: Merriam-Webster's Learner's Dictionary

Full Definition of undercoat

  1. 1 :  a coat or jacket worn under another

  2. 2 :  a growth of short hair or fur partly concealed by the longer and usually coarser guard hairs of a mammal

  3. 3 a :  a coat (as of paint) applied as a base for another coat b :  undercoating

  4. 4 dial :  petticoat

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