against the world

Prepositional phrase

idiomatic of people usually

(idiomatic, usually of people) Together; as a group, unit, or couple.

Japanese Meaning

（人々が）共に行動する、団結して一緒にいる / （カップルやグループとして）一体となっている

They stood against the world, refusing to let anyone separate them.

彼らは一丸となって、誰にも引き離されることを拒んだ。

Sense（1）

(idiomatic, usually of people) Together; as a group, unit, or couple.

It's you and me against the world.