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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

When a solar storm hits Earth, it causes the upper atmosphere to expand and thicken, increasing drag on satellites.

From Science Daily • Jan. 28, 2026

But these latest revelations only thicken the mystery: Who was Joan Didion?

From Los Angeles Times • Apr. 22, 2025

Whisk if lumpy and allow time to thicken.

From Salon • Feb. 27, 2025

I knew if I ran, the sobbing would pursue me, and the water would thicken into quicksand.

From "The City Beautiful" by Aden Polydoros

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