馴なれ合あう

godan verb (-u), intransitive verb

collude; conspire

Used for secret, often dishonest cooperation between parties. Implies an improper or underhanded agreement.

• 政せい治じ家かと企き業ぎょうが馴なれ合あって不ふ正せいを行おこなった。

  The politicians and the company colluded to commit fraud.

godan verb (-u), intransitive verb

become friendly; get along well

Describes people becoming close or getting along well, often through shared experience or time spent together. Can be used for animals becoming tame with each other.

• 新あたらしいクラスメートとすぐに馴なれ合あった。

  I quickly became friends with my new classmates.

godan verb (-u), intransitive verb

become intimate; establish a secret liaison

Specifically for romantic or sexual intimacy, often with a secretive or illicit nuance. Used for relationships that develop discreetly.

• 二人ふたりは人ひと目めを忍しのんで馴なれ合あうようになった。

  The two began to meet secretly and became intimate.