ADJ. gas, water | burst, leaking There's a burst water main in Quarry Road.
VERB + MAIN lay They're laying a new gas main through the town.
MAIN + VERB serve sth The main serves four villages. | explode, leak
MAIN + NOUN electricity, gas, water an island without mains electricity
PREP. at the ~s Turn the water off at the mains. | on the ~s Some of the remoter houses in the village are not on the mains.