This is the 11601st most frequent Portuguese word.
pecar
"To sin."
Here, 'pecar' means to sin in a moral or religious context.
Eu não quero pecar, então vou agir com honestidade.
I don't want to sin, so I will act with honesty.
In this sentence, 'pecar' refers to failing or making mistakes in a more general sense.
Ele costuma pecar no trabalho por não atender aos prazos.
He often makes mistakes at work by not meeting deadlines.
Here, 'pecar' is used to imply an error or omission due to negligence.