pecar
sin
pecado
sin
+
-ar
verb suffix
Pecar means to sin and is the verb form of the noun pecado0 (sin0) with the verb1 ending -ar1.
verb
  1. sin
    To sin or commit a sin
    No debemos pecar contra nuestros principios. // We should not sin against our principles.
  2. err
    To err or make a mistake
    Es humano pecar y equivocarse. // It's human to err and make mistakes.