- 1a large pipe that carries water or gas to a building; a large cable that carries electricity to a building a leaking gas main see also water main
- 2a large pipe that carries waste water and sewage (= human waste, etc.) away from a building Idioms
used to say that a statement is true in most cases The service here is, in the main, reliable. In the main, the money raised goes to children's charities.
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