訓 しず(む),しず(める) ・ 音 チン,ジン
Sino-Vietnamese: trầm
The water radical 氵 plus 冘 for sound: something sinking into water. Sino-Vietnamese trầm, as in trầm tư (deep in thought).
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太陽が西に沈む。 (たいようがにしにしずむ)
The sun sets in the west.