pipe + clay
pipeclay (countable and uncountable, plural pipeclays)
pipeclay (third-person singular simple present pipeclays, present participle pipeclaying, simple past and past participle pipeclayed)
- (transitive) To whiten by application of pipeclay.
- 1914, James Joyce, An Encounter (in Dubliners)
- I sat up on the coping of the bridge admiring my frail canvas shoes which I had diligently pipeclayed overnight and watching the docile horses pulling a tramload of business people up the hill.
- 1938, Xavier Herbert, Capricornia, Chapter VII, p. 92, 
- The walls were lined with paper-bark, pipe-clayed and panelled with polished bloodwood.
- (transitive, slang, dated, Britain) To clear off.
- to pipeclay accounts