Correct

刀口

/ dāokǒu / 
Strokes

Definition

the edge of a knife/cut/incision

Example

As a Noun

knife edge/blade

1
Dāokǒu
刀口
fēnglì
锋利
  
。

The knife has a sharp edge.

As a Noun

crucial point

2
Qián
钱
yào
要
huā
花
zài
在
dāokǒu
刀口
shàng
上
  
。

Use the money where it's needed most.

3
Bǎ
把
lìliang
力量
yòng
用
zài
在
dāokǒu
刀口
shàng
上

direct one's efforts to the right spot; turn one's efforts to the right direction

As a Noun

cut; incision

4
Dāokǒu
刀口
shàngwèi
尚未
yùhé
愈合
  
。

The cut has not healed over yet.