interferir

Senses

1. 1.

   to interfere

   to involve oneself in a situation where one is not wanted or needed

2. 2.

   to intervene

   to take action to change or influence a situation

3. 3.

   to affect, to impact

   to have an effect on something, usually negative

Examples

• "Não quero interferir na sua decisão, mas acho que você deveria pensar melhor."

  I don't want to interfere in your decision, but I think you should think it over.

• "O barulho da rua interfere na minha concentração."

  The street noise affects my concentration.

• "O governo decidiu interferir no mercado para controlar os preços."

  The government decided to intervene in the market to control prices.

Usage

Commonly used with the preposition "em" (interferir em algo/alguém). Register is neutral and used in both formal and informal contexts. Note that "interferir" often carries a negative or unwanted connotation, though it can be neutral when meaning simply "to affect" or "to have an impact on."