thicken

/ˈθɪkən/
verb
  1. To become thicker or make something thicker in consistency.
    • Add a little flour to thicken the sauce.
    • You can thicken the soup by simmering it longer.
    • The fog began to thicken as the evening went on.
  2. To become more dense, crowded, or intense.
    • Traffic began to thicken near the stadium after the concert.
    • As the forest thickened, it became harder to see the trail.
    • The plot of the mystery novel started to thicken when a new suspect appeared.
Antonyms
What does "thicken" mean? | whatsthatwordmean | whatsthatwordmean