wear off

US /wer ˈɔf/
UK /wer ˈɔf/
"wear off" picture
1.

薄れる, 消える, 効果がなくなる

to gradually disappear or stop having an effect

:
The effects of the painkiller started to wear off.
鎮痛剤の効果が薄れ始めた
The novelty of the new toy will soon wear off.
新しいおもちゃの目新しさはすぐに薄れるだろう。