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to spring at; to leap upon; to swoop down on; to throw oneself upon (e.g. an enemy)
犬が侵入者に飛び掛かった。
The dog leaped at the intruder.
猫がカーテンに飛び掛かっている。
The cat is pouncing on the curtain.
獲物を見つけたライオンが今にも飛び掛かる気配だ。
The lion that spotted its prey looks like it's about to pounce.