薬くすりになる

expression, godan verb (-ru)

be beneficial; do good; be a lesson

Figurative expression meaning an experience (often a hardship or scolding) serves as good medicine for personal growth. Commonly used with the particle に to mark the beneficiary.

• 今こん回かいの失しっ敗ぱいは彼かれにとって薬くすりになるだろう。

  This failure will probably be a good lesson for him.

• 厳きびしい言こと葉ばも時ときには薬くすりになる。

  Harsh words can sometimes do you good.