side effect
US /ˈsaɪd ɪˌfekt/
UK /ˈsaɪd ɪˌfekt/
1.
a secondary, typically undesirable effect of a drug or medical treatment
:
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Drowsiness is a common side effect of this medication.
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Always read the label for potential side effects.
2.
an additional, often unforeseen, consequence of an action or decision
:
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The new policy had some unexpected side effects on employee morale.
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One side effect of rapid growth can be increased traffic congestion.