"police tried to break up the gang"
"a pack of thieves"
"he still hangs out with the same crowd"
When those boys start ganging up, you can expect trouble.
那些孩子一结成伙,你就等着麻烦事吧。
A number of unruly youth ganged up and terrorized the district.
一些不法青年结成一伙,使这个地区充满恐怖。
gang up against〔on〕 sbShe feels that everyone's ganging up against her.
她感到所有的人都结成伙来对付她。
A group of people ganged up against the man who beat his dog.
一群人聚集起来,制止那个人打他的狗。
The spokesman said that Australia,Canada and New Zealand would gang up against Britain's joining the Common Market.
发言人说,澳大利亚、加拿大和新西兰会联合反对英国加入共同市场。
That small nation is afraid that if she makes one false move the other countries may gang up on her.
那个小国担心一旦行动有了差错,别的国家可能会联合起来制裁它。
The victim had no chance when four or five thugs ganged up on him.
当四五个暴徒联合起来攻击那个受害者时,他就没有任何反抗的机会了。