Correct

淤滞

/ yūzhì / 
Strokes

Definition

silted up/obstructed by silt/variant of 瘀滞[yū zhì]

Example

As a Verb

(of a river) be retarded by silt; silt up

1
Shūtōng
疏通
yūzhì
淤滞
de
的
hédào
河道

dredge the sluggish river