Idiom
drop someone a line and drop someone a few lines
Theme: COMMUNICATION - WRITTEN
to write a letter or a note to someone. (The line refers to lines of writing.)I dropped Aunt Jane a line last Thanksgiving.She usually drops me a few lines around the first of the year.
Idiom
drop someone a linedrop (someone) 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.