Noun
A cellar or other compartment for storing coal. [from 17th c.]
A hole in the pavement with a removable hatch, leading to an underground coal bunker. [from 18th c.]
Source: en.wiktionary.orgI know many married men, I even know a few happily married men, but I don't know one who wouldn't fall down the first open coal hole running after the first pretty girl who gave him a wink. George Jean Nathan