Definition of «vertical lines»

The phrase "vertical lines" refers to straight lines that go straight up and down, like vertical columns or poles.

The next button to the right is in the shape of three vertical lines of varying lengths. (canadianlawyermag.com)
Lots of vertical lines in your fingertips indicate adrenal stress. (thehealthyhomeeconomist.com)
Do you see nice, plump fingertips or is the skin covered with vertical lines? (thehealthyhomeeconomist.com)
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