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 lower in character, quality, or value; to degrade.
To lower the value of (a currency) by reducing the amount of valuable metal in the coins.