throw someone a curveball

US /θroʊ ˈsʌm.wʌn ə ˈkɜrv.bɔl/
UK /θroʊ ˈsʌm.wʌn ə ˈkɜrv.bɔl/
"throw someone a curveball" picture
1.

予期せぬ困難を投げかける, 驚かせる

to present someone with an unexpected difficulty or challenge

:
The boss really threw us a curveball with that last-minute change to the project.
上司はプロジェクトの土壇場での変更で、本当に私たちを驚かせた
Life can sometimes throw you a curveball when you least expect it.
人生は予期せぬ時に、時々予期せぬ困難を投げかけることがある。