v. t.
And this may to thicken other proofs. Shak. [ 1913 Webster ]
v. i. To become thick. “Thy luster thickens when he shines by.” Shak. [ 1913 Webster ]
The press of people thickens to the court. Dryden. [ 1913 Webster ]
The combat thickens, like the storm that flies. Dryden. [ 1913 Webster ]
n. Something put into a liquid or mass to make it thicker. [ 1913 Webster ]