訓 しめ(る),しめ(す),うるお(う),うるお(す) ・ 音 シツ,シュウ
Sino-Vietnamese: thấp
The water radical 氵: moisture seeping into everything. Sino-Vietnamese thấp, as in phong thấp (rheumatism, lit. wind and damp).
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梅雨は湿度が高い。 (つゆはしつどがたかい)
Humidity is high during the rainy season.