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undercoat

noun

  1. Obsolete a coat worn under another
  2. an under layer of short hair in an animal's coat
  3. a coating as of tarlike material applied to the exposed underside of a motor vehicle to deaden noise, retard rust, etc.
  4. a coat of paint, varnish, etc. applied as a first coat or before the final coat
Also (for undercoat & )undercoating

transitive verb

to apply an undercoat to

See undercoat in American Heritage Dictionary 4

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