side effect

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(side-ef-fect) 3 syllables

Definition

noun. A secondary, typically undesirable effect of a drug or medical treatment.

Example Sentence

The medication helped relieve the symptoms but had a side effect of drowsiness.

More Example Sentences

Some people experience a mild side effect from the vaccine, such as a sore arm.

Synonyms

reaction; consequence; byproduct

Antonyms

benefit; advantage; positive effect

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side effect
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