Wiktionary
top line
Etymology 1 n. (context accounting English) Total sales or revenue. Etymology 2
n. 1 (context military English) A flag on the edge of a minefield. 2 (context linguistics English) The line connecting individual letters in Devanagari.
Usage examples of "top line".
If we focus on satisfying our customers and take care of the top line of our business, the bottom line will always follow.
The black water surged across it through the buildings, level with the top line of their windows.
Gray scale down one side of the image, magnification in the top line.