stumbling block
US /ˈstʌm.blɪŋ ˌblɑːk/
UK /ˈstʌm.blɪŋ ˌblɑːk/

1.
걸림돌, 장애물
a difficulty or obstacle that prevents progress or achievement
:
•
Lack of funding proved to be a major stumbling block for the project.
자금 부족이 프로젝트의 주요 걸림돌로 판명되었다.
•
His inability to compromise was a constant stumbling block in negotiations.
그의 타협 불능은 협상에서 끊임없는 걸림돌이었다.