“Onus” (responsabilidad) is a noun and it means responsibility. The plural is onuses.
Examine these examples:
- The onus is on the manufacturers to produce a safe product (la responsabilidad es de los fabricantes de producir…).
- The onus is on the lawyer to prove it (la carga de la prueba recae en la acusación).
- The onus of proof is on the prosecution (la responsabilidad recae en la fiscalía).
- So in many things in life, we have the onus to do something, whether it be moral or legal.
If you want to have a high level in English the onus is on you! These blog articles will help you.