origin:  American, via Italian parolo or French paroli; from Latin pār= pair.
Sum of the original stake combined with its winnings.
If the player wins 2, then bets that same 2, which wins them 4 = a parlay.
To take the winnings of one gamble and place them on another.
Informal: To take the benefits of anything, including one's own talents or achievements, and use them to procure something else of value; to successfully exploit an opportunity.
example: I'm parlaying this vocabulary post into a mention that today is my birthday!