thicken up
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
To become or make (something) thick (either in width or in viscosity).
Register: informal
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “thicken up” mean?
To become or make (something) thick (either in width or in viscosity).
Is “thicken up” formal or informal?
thicken up is generally informal.