1. First person singular preterite of 'bloquear' - to obstruct, prevent passage, or stop something from functioning
I blocked the door so no one could enter.
Bloquei a porta para que ninguém entrasse.
2. To prevent someone from contacting you (social media, messaging apps, phones)
I blocked him on social media after our argument.
Bloquei ele nas redes sociais depois da briga.
3. To freeze or lock (an account, card, or system)
I blocked my credit card when I lost my wallet.
Bloquei meu cartão de crédito quando perdi minha carteira.