Britain and France were both working on developing a supersonic aircraft when they decided to join forces in 1962.
The companies plan to join forces to become the world's third-largest internet provider.
They decided to combine forces to create the proposal.
There's talk that the two singers might join forces for a tour next year.
Once arch-enemies, the two groups are now combining forces to save these threatened habitats.
See also: force noun (PHYSICAL)