1. An unintended secondary effect or consequence, typically an adverse reaction caused by a medication or medical treatment
The medication can cause side effects such as drowsiness and dizziness.
O medicamento pode causar efeitos colaterais como sonolência e tontura.
2. Any undesirable or unintended consequence of an action, decision, or process
A side effect of the new policy was increased employee turnover.
Um efeito colateral da nova política foi o aumento da rotatividade de funcionários.