To swarm up or rush forward all at once, describing a crowd or group moving together eagerly or chaotically.
一下子全都围上去。形容周围的人同时向一个目标猛挤过去。
明·罗贯中《三国演义》第六十七回吕蒙亲自擂鼓，士卒皆一拥而上，乱刀砍死朱光。”
As soon as the shop opened, customers swarmed in all at once, buying up the discounted items.
Learn the next connected idiom: 一拥而上 (yī yōng ér shàng) → 上行下效 (shàng xíng xià xiào)
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