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Definitions

thicken

[thik-uhn] / ˈθɪk ən /
VERB
set; make more dense
Synonyms
STRONGEST
clot condense congeal curdle swell
STRONG
add buttress cake clabber coagulate deepen enlarge expand freeze gel harden inspissate jell jelly ossify petrify reinforce solidify stiffen widen
WEAK
grow thick
Antonyms
STRONGEST
thin
STRONG
abridge decrease diminish lessen liquefy lower melt reduce shrink soften subtract weaken
WEAK
dilute water down

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

At the same time, M proteins can also cause the blood to thicken and concentrate in urine, both of which can cause renal problems.

From Slate • Mar. 29, 2026

Coastal areas could see marine layer low clouds return as early as Friday night and thicken on Saturday night.

From Los Angeles Times • Mar. 18, 2026

One idea BBC News recently looked at was a plan to pump seawater over the surface of Arctic sea-ice in winter to thicken it, giving the ice a better chance to survive the summer.

From BBC • Sep. 9, 2025

Give it a few minutes to thicken and voila, you have gravy.

From Salon • Feb. 13, 2025

So I wait for the line of passengers to thicken.

From "The Bletchley Riddle" by Ruta Sepetys and Steve Sheinkin

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.