drop a line
– send a brief letter
– to call over telephone
– send an email, etc.
– send any kind of moral short letter or note to someone for chit-chat or hello.
1. If you’ve got a few minutes to spare you could always drop her a line.
2. We really do like hearing from you, so drop us a line and let us know how you are.
3. I dropped Aunt Kelly a line last Thanks giving.
4. She usually drops me a few lines around the first of the year.
5. Drop me a note when you get a chance.
6. I hope you’ll drop me a line soon
7. The wife is always dropping her husband a line even as they are separated.
8. If you get a chance, drop me a line when you arrive in Surrey, Canada
9. Could you drop me a line when you get moved in to your new home?.
This idiom uses line in the sense of “a few words in writing,” a usage first recorded in 1647.