Wiktionary
pug mills
n. (pug mill English)
Usage examples of "pug mills".
There would be storage vats and mills: edge-runner mills to separate pigments from crude ores, ball mills to powder the pigments, pug mills to mix them with oil.
The guy starts a tirade about using electric pug mills, but finally he can’.
There were flashes of molten iron, the yellow flares of fires, and a lunatic cacophony of noises: men shouting, chains rattling, pug mills hammering, compressed air shrieking.