濃こい仲なか

noun

close relationship; intimate bond; thick as thieves

Colloquial and somewhat rare; describes a very close, often romantic or deeply affectionate relationship. The word 濃い (thick, dense) metaphorically suggests a strong, inseparable bond. Compare with 恋仲 (こいなか), which specifically means 'in love with each other'.

See also: 恋仲

• あの二人ふたりは濃こい仲なからしいよ。

  Those two seem to be really close.

• 彼かれとはただの友とも達だちじゃなくて、濃こい仲なかなんだ。

  He and I aren't just friends; we have a deep bond.