車の両輪

Meaning

1. exp
   two halves of the whole; two wheels on which everything rolls

Example sentences

• お前と俺は、今回のプロジェクトでは車の両輪ということだろう。仲良くしないことにはうまくいかないよ。

  It seems you and I are essential to this project. We'd better get along or it'll go badly.