人多势众 Many and powerful
Explanation
形容人数众多，力量强大。
To describe a large number of people and their strength.
Origin Story
大观园里，宝玉和一群小伙伴玩耍。一次，他们遇到薛蟠一伙人，薛蟠等人仗着人多势众，欺负宝玉的小伙伴秦钟。宝玉虽然生气，但面对人多势众的薛蟠等人，一时也难以招架。这时，贾瑞刚好路过，见此情景，立即上前制止，并责令薛蟠等人向秦钟赔礼道歉。薛蟠等人见贾瑞身份地位不低，而且宝玉及其他小伙伴也在一旁声援，知道贾瑞人多势众，于是乖乖地向秦钟赔礼道歉，这场风波才算平息。
In the Grand View Garden, Baoyu and a group of his friends were playing. Once, they encountered Xue Pan and his gang. Xue Pan and others, taking advantage of their large numbers, bullied Baoyu's friend Qin Zhong. Although Baoyu was angry, he could not cope with the numerous Xue Pan and others for a while. At this time, Jia Rui happened to pass by and, seeing this situation, immediately stepped forward to stop them and ordered Xue Pan and others to apologize to Qin Zhong. Xue Pan and his group saw that Jia Rui's status was not low, and Baoyu and his friends were also supporting him. Therefore, Xue Pan and others obeyed and apologized to Qin Zhong, so the storm subsided.
Usage
常用作谓语、宾语；形容一方人数众多，力量强大。
Often used as a predicate or object; describes the superiority of one side in terms of numbers and strength.
Examples
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这次谈判，我们人多势众，一定能取得胜利。
zhe ci tan pan, women ren duo shi zhong, yi ding neng qu de sheng li
In this negotiation, we have the advantage of numbers and will surely win.
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面对强敌，他们虽然人多势众，但缺乏组织性和纪律性，最终还是失败了。
mian dui qiang di, tamen suiran ren duo shi zhong, dan que fa zu zhi xing he ji lü xing, zui zhong hai shi shi bai le
Despite their numerical superiority, they lacked organization and discipline, and ultimately failed.