Becoming distant in a relationship; lack of contact or communication leading to estrangement.
大学時代の友人と疎遠になってしまった。
I've grown distant from my college friends.
両親とはここ数年疎遠だが、電話で話すことはたまにある。
I've been distant from my parents for the past few years, but we sometimes talk on the phone.
引っ越しを機に友人関係が疎遠になることがよくある。
It's common for friendships to become distant after moving.