THICKEN

verb (~ed; ~ing) Date: 14th century intransitive verb 1. to become dense , to become concentrated in numbers, mass, or frequency, to grow blurred or obscure, to grow broader or bulkier, to grow complicated or keen , transitive verb 1. to make thick, dense, or viscous in consistency , to make close or compact, to increase the depth or diameter of, to make inarticulate ; blur , ~er noun