To accumulate, to pile up, to increase in stages.
To close up by building.
To strengthen.
In solitaire card games, to place a card over another card of lower value. (e.g., place 5♦ over 4♣)
To erect; to construct.
To increase (an asset, money, etc.) by gambling or investing in a daring manner.
To carry forward the stake and winnings from a bet on to a subsequent wager or series of wagers.
To convert (a situation, thing, etc.) into something better.
A bet or series of bets where the stake and winnings are cumulatively carried forward; an accumulator.