JLPT N1Idioms

破竹の勢い

Meaning
勢いが激しくとどまるところを知らない様子
Explanation
「破竹の勢い」 is a metaphor for momentum so fierce and vigorous that it cannot be stopped. It comes from the fact that once the first joint of bamboo is split, the rest splits all at once, and is used for an unstoppable winning streak such as consecutive victories. Unlike c3 「すぐ消える」 (disappears quickly) and c4 「途中で衰える」 (weakens partway), the core point is that the momentum is sustained and expands.
Original Japanese explanation

「破竹の勢い」は、止めようがないほど激しく盛んな勢いのたとえ。竹は最初の一節を割れば後は一気に裂けることに由来し、連戦連勝など止まらない快進撃に使う。c3「すぐ消える」やc4「途中で衰える」とは逆で、勢いが持続・拡大する点が核心である。

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