stagnant water; standing water
Water that has collected and remains still, often in a depression or container, and may become stale.
庭に溜まり水ができて、蚊が発生した。
Stagnant water formed in the garden, and mosquitoes bred.
古いバケツに溜まり水がたまっている。
Stagnant water has collected in the old bucket.
Standard kanji spelling.
Mixed kana-kanji spelling; less common but still encountered.
Compound of 溜まり (noun form of verb 溜まる 'to accumulate') and 水 (water).