The upper curvature of a horse's withers, back, and loin.(noun)
Principal billing.(noun)
To be billed as the primary entertainer(verb)
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Use "topline" in a sentence
"The topline is that public support for the U.S. presence is dropping."
"We also continue to make strategic investments in growth initiatives which should enable us to deliver a sustainable long-term topline growth."
"The reason it is so important to put this on the table now and scrutinize it openly is that the amount agreed to over the next 30 days -- for 2010 -- will represent what budgeteers call a "topline" -- a critical benchmark."