built up

/bɪlt ʌp/
adjective
  1. Covered with many buildings or houses; developed as a town or city area.
    • The built-up area of the city has very few parks.
    • We drove through a built-up neighborhood with shops and apartments on every street.
    • Many birds avoid built-up regions and prefer open countryside.
  2. Made stronger or thicker by adding layers or materials.
    • He wore a built-up heel on one shoe to correct his leg length.
    • The shoes have built-up soles to give extra height.
    • The walls are built-up with extra insulation to keep the house warm.
  3. Increased or accumulated over time, especially of feelings or pressure.
    • After weeks of stress, she felt a built-up need to take a vacation.
    • There was a built-up tension in the room before the announcement.
    • The built-up anger finally exploded during the argument.
Antonyms
What does "built up" mean? | whatsthatwordmean | whatsthatwordmean