noun
still water; stagnant water
Refers to water that is not flowing, often in a pond, pool, or container. Can imply stagnation.
池の止水に月が映っていた。
The moon was reflected in the still water of the pond.
noun, noun or participle which takes 'suru', intransitive verb
stopping water flow; water stoppage
The act or state of stopping the flow of water, often used in technical or engineering contexts. Can be used as a noun or with する.
工事のため、明日は終日止水します。
Due to construction, water will be shut off all day tomorrow.