''It's part of the business,'' he said. ''I understand there's a bottom line to everything we do. We didn't win a lot of football games the past few years.''
I know "bottom line" as the most important thing, but seems l
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I'll explain the two possible explainations that came to my mind when I've read your question.
Since the speaker continued saying "We didn't win a lot of football games the past few years", there's an emphasis on not achieving some goals, likely financial ones. So I'm drawn to the second option. Though, I'd like to have a better vision on the whole situation of the speaker.
Mhh... It's troubling me. It could very well be the first case with the following meaning:
"We train, we come up with tactics, we prepare as much as we can, but in this business there's a bottom line, we either win or lose, and we didn't win a lot recently".
So, I'd need more context.
It's a metaphor from accounting. There are a lot of factors in a business's profitability, but the end result is tallying assets vs liabilities on a balance sheet, and putting the result in a line at the bottom that will tell you what it is.
Likewise there are a lot of factors in the sport, but the end result telling whether you are good is your team winning.