cog : Idioms & Phrases
cog railway
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noun railway for steep mountains; a cogwheel on the locomotive engages cogs on a center rail to provide traction
rack railway.
WordNet
Cogged breath sound
(Auscultation) , a form of interrupted respiration, in which the interruptions are very even, three or four to each inspiration.
Webster 1913
Hunting cog
(Mach.) , a tooth in the larger of two geared wheels which makes its number of teeth prime to the number in the smaller wheel, thus preventing the frequent meeting of the same pairs of teeth.