合作：开始合作以达到某个目标。
联合力量：开始合作以达到某个目标。
work together on a common enterprise of project
同义词： collaborate / cooperate / get together
... gain a foothold：站稳脚跟，取得立足点 stumble across：偶然发现 join forces：协力；团结 ...
联合(join forces with), 此释义来源于网络辞典。
join forces （with）联合；合作 The rider forced his horse on through the storm.骑士迫使他的马在暴风雨中前进。
... conservationist n. 环保主义者 join forces 携手 elevate the public awareness 增强公众意识 ...
They could join forces to buy aluminium cans, as well as raw ingredients such as malt. This is the single biggest cost of each drink they sell.
他们可以集中力量购买铝罐，还有例如麦芽这样的原材料。这是他们每卖一瓶饮料的单个最高成本。
The two bands join forces for a gig at Madison Square Garden on November 28.
这两支乐队将于11月28日在麦迪逊广场花园联手举行一场演出。
Both governments and ordinary citizens should join forces to make this world a better place to live in, not only for ourselves but also for future generations.
不仅仅是为了我们，更是为了我们的后代，政府和市民应该联合起来，使这个世界变成更美好的家园。
It is a forum set up by former President Bill Clinton to encourage leaders from government,business,academia and other fields to join forces to deal with global challenges.
VOA : standard.2009.09.23
Organizers say another aim of the walk is to recruit members of different faiths to join forces in community service projects to clean the environment and help the poor.
VOA : standard.2009.10.19
"It should really serve,I think, as a stimulus to us to find ways to recapture the partnership so we can join forces and fight together against the threats and challenges of the 21st century that are no less dangerous than Hitler was in his time."
VOA : standard.2010.05.07
It encourages doctors, clinics, hospitals and insurers to join forces and beef up prevention-oriented services.
FORBES: Obamacare Spurs New Thinking On Using the Market to Pay for Prevention
Feeling isolated on their campuses, they decided to join forces at an annual gathering.
FORBES: Net Impact's Army for Good and the Rise of the Enlightened Merchant
Horton decided to join forces with Winston Gutteridge, his counterpart at the World Health Organization.
《join forces》这首歌是fripSide演唱的，作为PC游戏《1/7的魔法使》的ED曲，2015年1月30日发行。