v. 1 make or become thick or thicker. 2 become more complicated (plot thickens). thickener n. thickening n. 1 becoming thick or thicker. 2 substance used to thicken liquid. 3 thickened part.
v. 1 make or become thick or thicker. 2 become more complicated (plot thickens). thickener n. thickening n. 1 becoming thick or thicker. 2 substance used to thicken liquid. 3 thickened part.