Drop a line Meaning – send a brief letter – to call over telephone – send an email, etc – send any kind of moral short letter or note to someone for chitchat or hello Examples 1 drop (one) a line To contact someone, usually with a letter, note, or phone call I know you'll be busy enjoying yourself, but please, drop me a line on your trip I'll drop you a line once I get settled in at school See also drop, line Farlex Dictionary of Idioms © 15 Farlex, Inc, all rights reserved(Phrase) Send me correspondance The origin is most probably from written, where a letter would be "dropped" into the lap of the reciever
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