The "daily total runs" line means that you are betting on if the COMPLETE slate of baseball games on any given day will go above or under a certain total.
For instance - let's say that there are 10 Major League Baseball games on the schedule. The "daily total runs" total might be set at 93.5, making the line look like this:
Over 93.5, -115
Under 93.5, -105
So, you would need to add up all of the runs scored in every game to arrive at the total.
So, if you think that today will be a very high-scoring day of baseball, you'd want to take the "Over".
If you take the over and there is a total of 111 runs scored on the day, you would easily win your bet.
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Most sportsbooks will offer the "daily total runs" line or some sort of variation of it on a daily basis.