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plural undercoats
A layer of short hairs underneath the longer ones of an animal's fur examples
A coat of paint or other material applied onto a surface before that of a topcoat; a coloured primer. quotations examples
The conversion process is carried out by Progress Rail at Longport, from where they are dispatched in undercoat to Eastleigh for final painting.
2022 November 30, David Staines, “The colourful Class 69s”, in RAIL, page 54
(obsolete) A coat for wearing indoors, under an overcoat.
third-person singular simple present undercoats, present participle undercoating, simple past and past participle undercoated
(transitive) To apply an undercoat to. examples