piaculum

Quod etiam nunc apud plerasque Orientis nationes piaculum sit, calceato pede templorum pavimenta calcasse.

Palam mutire plebeio piaculum est—For a common man to mutter what he thinks is a risky venture.

Eratque piaculum aras adire, vel hostiam contrectare, antequam Magus conceptis precationibus libamenta diffunderet prcursoria.

The term piaculum has the advantage that while it suggests the idea of expiation, it also has a much more extended signification.

The term "piacular sacrifice" (piaculum) had a wide range of meaning, apart from the examples here given.