白しろ黒くろをつける

expression, ichidan verb

settle a matter; determine right or wrong; make clear

Colloquial expression meaning to resolve a dispute or ambiguous situation by clearly deciding which side is correct or what the truth is. Often used when someone demands a clear yes/no or right/wrong judgment.

• この問もん題だいは早はやく白しろ黒くろをつけなければならない。

  We need to settle this matter quickly.

• 彼かれはいつも物もの事ごとに白しろ黒くろをつけたがる。

  He always wants to determine whether things are right or wrong.