According to the Free Dictionary, dropping someone a line means sending them a short message.
Is this correct? I always thought it meant phoning someone, the line referring to a telephone line.
It's funny how many phrases in language completely lose context with their origins over time. "Drop a call" seems like a different nuance than "drop a line". And there is the action of dropping a line as in the actual telephone cable line being dropped into the ground for installation.
I also interpret "drop me a line" to come from dropping someone a line of rope to reach them (connect with them). By that interpretation, and mode of communication involving any kind of line seems to qualify – a telephone line, a line of text, or even a pickup line in a bar (which has the added irony of dropping vs. picking up) :)
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