Inflatable; able to be blown up.
An enlargement (e.g. of a photograph).
An explosion (physical or emotional).
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.