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

1.
绊脚石, 障碍
a difficulty or obstacle that prevents progress or achievement
:
•
Lack of funding proved to be a major stumbling block for the project.
资金不足被证明是该项目的主要绊脚石。
•
His inability to compromise was a constant stumbling block in negotiations.
他无法妥协是谈判中一个持续的绊脚石。