Correct

淤

/ yū / 
Strokes

Definition

silt/river sludge/to silt up/choked with silt/variant of 瘀[yū]

Example

As a Noun

silt; sediment

1
Héyū
河淤

sludge from a riverbed

2
Yǐn
引
yūféi
淤肥
tián
田

fertilize the soil with silt

As a Verb

become silted up; be choked with silt

3
Hélǐ
河里
yū
淤
le
了
hěnduō
很多
níshā
泥沙
  
。

The river has been silted up.

4
Dàshuǐ
大水
guòhòu
过后
dìmiàn
地面
yū
淤
le
了
yī
一
céng
层
hòuhòude
厚厚的
níshā
泥沙
  
。

A thick deposit of silt covered the fields after the floods subsided. / The flood left a large deposit of silt in the fields.

As an Adjective

silted (up)

Definition

(of blood) stasis

As a Verb

(of boiling liquid) spill; overflow