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1. A coat worn beneath another coat.
2. A covering of short hairs lying underneath the longer outer hairs of an animal's coat.
3. also un·der·coat·ing (-kō′tĭng)
a. A coat of sealing material applied to a surface before the outer coats, as of paint, are applied.
b. The sealing material used for this purpose.
c. A tarlike substance sprayed on the underside of a vehicle to prevent rusting.
tr.v. un·der·coat·ed, un·der·coat·ing, un·der·coats
To apply an undercoat to.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Building) another word for undercoat1, undercoat4
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈʌn dərˌkoʊ tɪŋ)

a protective seal applied to the underside of an automobile.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Once the first ceiling coat is done, wrap the roller in a plastic bag and start undercoating the woodwork.
Start in the corner of the room and work outwards, painting in small sections and always rolling back into your wet work.Once the first ceiling coat is done, wrap the roller in a plastic bag and start undercoating the woodwork.
Offering a wide range of services which include fleet management system, preventive maintenance system, wheel alignment, tire changing and balancing, carwash, detailing, and undercoating; brake, suspension, clutch, engine; transmission, air-conditioning system; body and paint, ValuePlus has steadily worked its way into becoming the preferred auto services provider by vehicle owners and Fleet Managers.
Two-part wood filler - If your door's in particularly bad condition repair the damage before undercoating. Do not use decorators caulk, as it's not appropriate for front doors.