join forces

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join forces (third-person singular simple present joins forces, present participle joining forces, simple past and past participle joined forces)

1. (idiomatic) To combine labour, to come together, to unite.
   • 2007 November, Elizabeth Drake, “Combine and conquer: Use these winning food pairings to protect your health”, in Men's Health, volume 22, number 9, →ISSN, page 124:

     It all started 6 years ago, as Rutgers University scientists Allan Conney, Ph.D., and George C. Wagner, Ph.D., chatted at an office get-together. […] From this conversation, the two decided to pool their knowledge and join forces.

   • 2018 December 22, Tom Woods, "Ben Shapiro and Bette Midler sittin' in a tree", Lewrockwell.com[1]

     When Hollywood and the neocons join forces against something, you know it has to be good.

   • 2020 June 17, Richard Clinnick, “Network News: MPs join forces to push for confirmation on HS2 to Leeds”, in Rail, page 22:

     MPs and non-affiliated peers from across the Leeds City Region have joined forces and are calling on Government to publicly commit to building HS2 East to Leeds at the same time as HS2 West is built to Manchester.

• band together