石橋を叩いて渡る
Meanings
1
being excessively cautious; knocking on a stone bridge before crossing it
Proverbial expression for extreme caution, often used critically when someone is too careful or hesitant. The literal image is of tapping a solid stone bridge to test its safety before crossing.
He has a personality of being excessively cautious, so he can't make decisions easily.
It's good to be cautious, but sometimes you need to be bold.