沈泥 is read as ちんでい (chindei) and means silt.
ちんでい
chindei
しずむ
to feel depressed
ちんせい
stillness
ちんか
sinking
ちんちゃく
composure
しずめる
to floor (an opponent)
ちんつう
grave
ちんこう
sedimentation (e.g. of red blood cells)
ちんすいしょくぶつ
submerged plant
ちんかばし
bridge designed to be underwater during a flood
ちんきん
gold-inlaid lacquerware (using powdered gold in etched grooves)
ちんし
weight (of a fishing net)
ちんまいこうほう
underwater tunnel construction by sinking prefabricated box culverts