1. become thick or thicker

[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;e.g. The sauce thickened
[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;The egg yolk will inspissate

[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;Synonym: thicken

2. make thick or thicker

[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;e.g. Thicken the sauce
[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;inspissate the tar so that it becomes pitch

[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;Synonym: thicken

3. make viscous or dense

[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;e.g. thicken the sauce by adding flour

[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;Synonym: thicken