淤

出淤泥而不染

chū yū ní ér bù rǎn

lit. to grow out of the mud unsullied (idiom)

淤伤

yū shāng

bruising

淤塞

yū sè

choked with silt

淤泥

yū ní

silt

淤浅

yū qiǎn

to silt up

淤滞

yū zhì

silted up

淤灌

yū guàn

to warp (fertilize land by flooding)

淤积

yū jī

to silt up

淤血

yū xuè

variant of 瘀血[yu1 xue4]

淤血斑

yū xuè bān

bruise

淤青

yū qīng

bruise

清淤

qīng yū

to dredge; to remove sludge