gang up

基本解释

A het-up gang of young men were advancing on a police line on Mare Street, stones in their hands.
一个亢奋的年轻人帮派在Mare Street街上朝著警方封锁线走过去，他们的手里握著石块。
In addition, they fostered an atmosphere where employees were expected to gang up on the person who was "it."
另外，他们还制造了一种让员工联合起来反对那人…的气氛。
bbs.chinadaily.com.cn
America is constantly looking for signs that China is going to welsh on the deal and turn aggressive—and China is looking for signs that America and its allies are going to gang up to stop its rise.
美国一直在寻找中国耍赖的信号，好以此寻衅滋事；而中国也在寻找美国及其盟友相互勾结遏制自己崛起的信号。

Martinez says arrests are up because federal payouts have boosted police programs targeting illegal guns, drugs and gang activity.

The kiranas should gang up into co-operatives so that they can buy in bulk from suppliers.
ECONOMIST: India needs a supermarket revolution
Year 5 is the time to pick a villain and gang up on him.
ECONOMIST: Plenty of gloom
Too fast and the other detractors will gang up on the new leader.
FORBES: Kim Jong Un's Challenges in Taking Over the Family Business (North Korea)

If people gang up on someone, they unite against them for a particular reason, for example in a fight or argument.