- to make or become thick or thicker, as in dimension, density, consistency, articulation, etc.
- to make or become more complex or involved: the plot thickened
tr. & intr.v.thick·ened, thick·en·ing, thick·ens
- To make or become thick or thicker: Thicken the sauce with cornstarch. The crowd thickened near the doorway.
- To make or become more intense, intricate, or complex: The leader's departure thickens the problems. Our apprehension thickened.
(third-person singular simple present thickens, present participle thickening, simple past and past participle thickened)