唇しん歯し輔ほ車しゃ

noun

mutual dependence; interdependence

A rare yojijukugo meaning that two parties are so closely connected that they cannot exist without each other, like lips and teeth or the cheek and jawbone. Used in formal or literary contexts.

• 両りょう国こくは唇しん歯し輔ほ車しゃの関かん係けいにある。

  The two countries are in a relationship of mutual dependence.