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drop a line
drop somebody a line
to send a short letter to someone We really do like hearing from you, so drop us a line and let us know how you are.
drop somebody a line
(slightly informal) to write a short letter to someone If you've got a few minutes to spare you could always drop her a line.
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.