Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “side effect”

See all translations

side effect

noun [C] uk   us  
C1 an unpleasant effect of a drug that happens in addition to the main effect: Does this drug have any side effects?C2 an unexpected result of a situation: A side effect of the new law is that fewer people will take out insurance.
More examples
(Definition of side effect from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of side effect?
Add Cambridge dictionaries to your browser to your website

Definitions of “side effect” in other dictionaries

Word of the Day

lamb

a young sheep, or the flesh of a young sheep eaten as meat

Word of the Day

The way we move (Verbs for walking and running)

by Kate Woodford,
March 25, 2015
​​​ This week we’re looking at interesting ways to describe the way that people move. Most of the verbs that we’ll be considering describe how fast or slow people move. Others describe the attitude or state of mind of the person walking or running. Some describe both. Starting with verbs for walking slowly,

Read More 

stackin’ p

March 30, 2015
idiom slang earning a lot of money ‘That’s a very generous present.”Yeah, well, she’s stackin’ p, innit?’

Read More