thicken

To make or become thick or thicker.

To make or become more intense, intricate, or complex.

To become thick or thicker.

To become deeper or heavier; gain bulk.

Of a liquid, to approach more nearly a state of solidity; gain firmer consistency; also, to become turbid or cloudy.

To become dark or obscure; specifically, of the weather, etc., to become misty or foggy.

To grow more intense, profound, animated, intricate, etc.; become complicated.

To gain in number or frequency; hence, to crowd; throng.

To become indistinct.

To make thick or thicker.