expression, noun
relationship of intuitive understanding; close rapport
Describes a relationship where two people understand each other so well that words are barely needed; often used of close friends or long-time partners.
あの二人はツーカーの仲で、目を見ただけで通じ合う。
Those two have such a close rapport that they understand each other just by looking into each other's eyes.
長年一緒に仕事をしてきたので、今ではツーカーの仲だ。
Having worked together for many years, we now have an intuitive understanding of each other.