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Definitions

side effect

NOUN
adverse or unwanted secondary effect
Synonyms
STRONGEST
aftereffect reaction
WEAK
aftermath aftertaste by-product carry-over concomitant corollary leftover offshoot secondary response side issue sidebar spinoff

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.

But there’s also a quieter side effect I’ve come to love.

From Salon • May 12, 2026

GLP-1 users, she added, have also gravitated toward fiber to help deal with constipation, a common side effect of those medications.

From MarketWatch • May 10, 2026

The airplane fire threat is a side effect of the proliferation of cellphones, tablets and other electronic devices powered by rechargeable batteries.

From The Wall Street Journal • May 6, 2026

Mild-to-moderate injection site reactions were the most common side effect, but nearly all of these reactions resolved themselves within five days.

From Barron's • Apr. 20, 2026

Now there’s a side effect of war I bet you never considered.

From "How I Live Now" by Meg Rosoff