undercloak

== English == === Etymology === From under- +‎ cloak. === Pronunciation === IPA(key): /ˈʌndə(ɹ)kləʊk/ === Noun === undercloak (plural undercloaks) (construction) A fixed underlayer of tile or fibre cement on a roof, to support the mortar above. === Verb === undercloak (third-person singular simple present undercloaks, present participle undercloaking, simple past and past participle undercloaked) (construction, transitive) To apply such an underlayer to.