Longman Dictionary of Contemporary English
Wiktionary
n. the principal underground pipe for conveying water to residential and business properties
WordNet
n. main (a pipe or conduit) for conveying water
Usage examples of "water main".
The little local exchange in Berkshire was out of action, the operator said, because a water main had burst and flooded a cable.
On this project, and on the Smuggler's Island investigation, which began with a memo about a water main and ended with a series on dope running in Key West, Savage observed firsthand Hiaasen's legendary insight.
The city engineers bustled around the surface, in the spotlights, as if repairing a broken water main.
If I leave home after hearing the main points of the news, I know that I will arrive in the office by nine o'clock unless there is some exceptional delay to traffic such as a fire or a burst water main.
A water main exposeda deep trench in the road, a dozen workmen up to their ankles in brimming water, a lone policeman waving at the traffic and directing them all south, into Finsbury, a loop past Farringdon station, through Clerkenwell and into Islington from the other side.
The lieutenant says we're gonna get out of here through the water main.