Definition of stumbling block noun from the Oxford Advanced Learner's Dictionary

 

stumbling block

 noun
noun
BrE
 
; NAmE
 
 
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stumbling block (to something) | stumbling block (to doing something) something that causes problems and prevents you from achieving your aim synonym obstacleExtra examples Money could prove a stumbling block to the project. The negotiations have hit a stumbling block over the price. The question of disarmament proved a major stumbling block to agreement. The peace process encountered another stumbling block in mid-June.
See the Oxford Advanced American Dictionary entry: stumbling block