Por motivos burocráticos, la universidad abrevió el plazo de entrega de las tesis.For bureaucratic reasons, the university shortened the deadline for thesis submission.
La ministra abrevió su estancia en Bruselas para asistir a una reunión de gabinete urgente en su país.The minister cut short her stay in Brussels to attend an urgent cabinet meeting in her country.
En fin, abrevio: no conseguimos ponernos de acuerdo y el proyecto nunca se llevó a cabo.Anyway, to cut a long story short, we could not agree and the project was never carried out.
Así que, abreviando, no hiciste la tarea porque no te dio la santísima gana.So, in short, you didn't do your homework because you just didn't feel like it.