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undercoat

[uhn-der-koht]
noun
1.
a coat or jacket worn under another.
2.
Zoology. a growth of short fur or hair lying beneath a longer growth.
4.
a coat of paint or the like applied under the finishing coat.
5.
a paint, sealer, or the like specially prepared for use underneath a finishing coat.
verb (used with object)
6.
to apply an undercoating to.

Origin:
1640–50; under- + coat

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
undercoat (ˈʌndəˌkəʊt)
 
n
1.  a coat of paint or other substance applied before the top coat
2.  a coat worn under an overcoat
3.  zoology another name for underfur
4.  the US name for underseal
 
vb
5.  (tr) to apply an undercoat to (a surface)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
There are three steps to a good paint job: surface preparation, priming or undercoating, and the finishing coats.
Surface preparation, undercoating and top coating application process shall be specified by the coating supplier.
Any area where undercoating is bulging due to flaky rust should be cleaned using a wire brush, treated with primer and re-coated.
The initial focus will be directed at spray-on bed liners and undercoating applications in the automotive industry.
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