build up

Short definition from Wiktionary

Verb

1. 1
   To erect; to construct.
2. 2
   To close up by building.
3. 3
   To accumulate: to increase incrementally or continually.
4. 4
   To strengthen.
5. 5
   In solitaire card games, to place a card over another card of lower value. (e.g., place 5♦ over 4♣)

Noun

1. 1
   Misspelling of buildup.
2. 2
   Alternative form of buildup.