When you bump someone in the street you say, desculpa! This is actually short for, me desculpa por favor. The verb is DESCULPAR – to excuse.
The word, CULPA comes from this verb and means, fault.
desculpar
to forgive, apologize
eudesculpo
você, eledesculpa
nósdesculpamos
vocês, elesdesculpam
Não precisa se desculpar. You don't need to excuse yourself.