expression, godan verb (-tsu)
lose contact with; cut off communication with; disappear
Used when someone intentionally or unintentionally stops all communication with another person, often implying a complete break. Can also refer to a person going missing.
彼は突然連絡を絶った。
He suddenly cut off all contact.
友達と連絡を絶っ
It's been five years since I lost contact with my friend.