drop somebody a line/note

drop a line

Correspond, write a short letter or note. For example, I hope you'll drop me a line soon. This idiom uses line in the sense of "a few words in writing," a usage first recorded in 1647.

See also: drop, line

drop somebody a ˈline/ˈnote

(informal) write a short letter, message, etc. to somebody: I dropped her a line inviting her to my birthday party.

See also: drop, line, note, somebody