expression
with irresistible force; with great vigor
Idiomatic expression likening momentum to splitting bamboo, which cracks easily all the way down once started. Used for unstoppable advances, rapid success, or overwhelming momentum.
新製品は破竹の勢いで市場を席巻した。
The new product swept the market with irresistible force.
彼のチームは破竹の勢いで勝ち進んだ。
His team advanced with unstoppable momentum.