bump on the road

A minor problem that interferes in someone's or something's progress, typically only temporarily. Her injury was certainly a bump on the road, but it didn't stop her from becoming the best tennis player in the world by the end of the year. At this point, all the contracts are signed, so any investigation by the authorities will be little more than a bump on the road for the merger. The project hit a bump on the road when Tom suddenly resigned, but we should be able to redistribute his assignment pretty easily.