A "stumbling block" refers to an obstacle or challenge that hinders progress or success. It can be a physical barrier, like a rock in a path, or a metaphorical one, such as a personal fear or a lack of resources. Stumbling blocks can occur in various aspects of life, including education, work, and personal relationships. Overcoming stumbling blocks often requires problem-solving skills and resilience. Individuals may need to seek support from others, develop new strategies, or change their approach to navigate these challenges. Recognizing and addressing stumbling blocks is essential for achieving goals and personal growth.