Definition of "build up" in English

Verb

1. To erect; to construct.

2. To close up by building.

   • to build up a door

3. To accumulate: to increase incrementally or continually.

   • Ever since the secretary left, the letters in my inbox have started to build up.

4. To strengthen.

   • They had to build up their fortress to protect against attack.

5. In solitaire card games, to place a card over another card of lower value. (e.g., place 5♦ over 4♣)

Noun

1. Misspelling of buildup.