drop someone a line

US /drɑp ˈsʌm.wʌn ə laɪn/
UK /drɑp ˈsʌm.wʌn ə laɪn/
"drop someone a line" picture
1.

連絡する, 手紙を書く

to send someone a letter, email, or message, usually a short one

:
Please drop me a line when you arrive at your destination.
目的地に着いたら、私に連絡してください
I'll drop you a line next week to confirm the details.
来週、詳細を確認するためにご連絡します