A small sin or fault.
The definition of a peccadillo is a small or unimportant sin or wrongdoing.
When you break a minor rule, this is an example of a peccadillo.
A minor or petty sin or fault.
Origin of peccadillo
- Spanish pecadillo diminutive of pecado sin, Italian peccadiglio diminutive of peccato sin both from Latin peccātum from neuter of peccātus past participle of peccāre to sin ped- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition