I haven't talked to her in a while, I should drop her a line to see how she's doing.

The voltage drop in a line can be decreased by

The sliver line that you see is actually an artifact and the edge of the drop.

To drop someone a line is to write them a short note--literally, a line of text.

It is not really an idiom, it is an elliptical statement that is completed by Drop someone a line (of text in his mailbox).

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