build up

verbo

To erect; to construct. · Near-synonym: build out
To close up by building. · to build up a door
To accumulate: to increase incrementally or continually. (intransitive, transitive) · Ever since the secretary left, the letters in my inbox have started to build up.
To strengthen. (transitive) · They had to build up their fortress to protect against attack.
In solitaire card games, to place a card over another card of lower value. (e.g., place 5♦ over 4♣)

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