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side effects

/ˈsaɪd ɪˈfɛkt/ · side ef·fects
noun
  1. Unintended or secondary consequences of a particular action, treatment, or product. The doctor warned her about the side effects of the new medication.
noun
  1. A secondary or indirect result of a particular situation or event. The side effects of the economic downturn were widespread unemployment and poverty.
Did you know? The term 'side effects' is often used in medical and scientific contexts to describe the unintended consequences of a particular treatment or product, but it can also be used more broadly to describe the secondary results of any situation or event.
Written by Lexi Wordsworth, Dictionary Editor 4 lookups Added Jul 31, 2026