Wiktionary
bet up
vb. (context gambling English) To make one's bet
Usage examples of "bet up".
He watched as the little man bet up a flush and lost to a full house.
The only job that was open was that of milker, and this reminded me of what Charley had said originally, that milking would be my best bet up here in the country.
IN this fashion he could not bet up nor could he effectively use his feet.