join forces 力を合わせる

join forces は力を合わせる、協力するです。 16:41 Kawahara and Nakae join forces and made improvements to the chair. 二人は協力して按摩椅子の向上に努めた。

[Begin Japanology] Season 5 EP15 : Massage Chairs 2012-04-26
https://www.youtube.com/watch?v=x-IJwyqvQb4  0:01 Britain and America are joining forces to thwart terrorist cyber attacks and communication online.
UK and US to set up unit to foil terrorist cyber attacks
https://www.youtube.com/watch?v=FJGjSq0OqrE  0:18 Japan and South Korea to join forces and clear the path toward the new era.
'Comfort Women' Agreement to Improve Japan-South Korea Ties
https://www.youtube.com/watch?v=IdYLx6BwoyM  0:10 announcing he's joining forces with John Kasich
Ted Cruz, John Kasich join forces to stop Donald Trump

練習問題解答
b-6366 joined forces with