keep in touch
US /kiːp ɪn tʌtʃ/
UK /kiːp ɪn tʌtʃ/

1.
連絡を取り合う, 連絡を保つ
to maintain communication with someone
:
•
Let's promise to keep in touch after graduation.
卒業後も連絡を取り合いましょうと約束しましょう。
•
It's important to keep in touch with old friends.
昔の友達と連絡を取り合うことは大切です。