godan verb (-ru), intransitive verb
freeze; become frozen; freeze over
Intransitive verb describing water, liquids, or surfaces turning into ice or becoming covered with ice. Often used for natural phenomena like ponds, pipes, or roads freezing.
寒さで池が凍った。
The pond froze because of the cold.
水道管が凍らないように
Please be careful so the water pipes don't freeze.
昨夜の冷え込みで路面が凍っている。
The road surface is frozen over from last night's cold snap.