Correct

刀笔

/ dāobǐ / 
Strokes

Definition

writing up of official or judicial documents/pettifoggery

Example

As a Noun

knife and brush—writing of indictments, appeals, etc; pettifoggery

1
Dāobǐ
刀笔
lǎoshǒu
老手

old hand in pettifoggery