unthicken means to make less thick. Lexicurio rates it Rare gem — a strength score of 81 out of 100.
Etymology
From un- + thicken.
verb
- To make less thick.“Ricouer's theory helps unthicken the images in these ancient texts, and there's a way in which this “unthickening” can be seen as exactly the work of the university.”
- To become less thick.“The darkness unthickens and a blowsy moon appears at the window.”