Definition of build ups:
(v) :
(intransitive, transitive, idiomatic) To accumulate: to increase incrementally or continually.
(v) :
To erect; to construct.
(v) :
(transitive, idiomatic) To strengthen.
(v) :
To close up by building.
(v) :
(card games) In solitaire card games, to place a card over another card of lower value. (e.g., place 5♦ over 4♣)
(n) :
Misspelling of buildup. [An accumulation; an increase; a gradual development.]