Meaning of “side effect” in the English Dictionary

american-english dictionary

"side effect" in British English

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side effectnoun [ C ]

uk /ˈsaɪd ɪˌfekt/ us /ˈsaɪd ɪˌfekt/

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.

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(Definition of “side effect” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"side effect" in American English

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side effectnoun [ C usually pl ]

us /ˈsɑɪd ɪˌfekt/

an unwanted or unexpected result or condition that comes along with the desired effects of something:

Does this drug have any side effects?

(Definition of “side effect” from the Cambridge Academic Content Dictionary © Cambridge University Press)