forfeit
to lose or give up something as a penalty for wrongdoing or failure to comply
He forfeited his right to appeal by missing the statutory deadline.
More GRE words starting with F
to make up something false in order to deceive
a deliberately false statement or invented account intended to mislead
a person who invents elaborate or untruthful stories
treating serious matters with inappropriate or flippant humor
achieved too easily and therefore superficial or shallow
to make an action or process easier or more achievable
a small, organized group within a larger one, especially one that is in opposition
inclined to form rival groups and provoke internal dissent
Learn words the way the GRE tests them.
Vocabulary sticks when you meet it in real sentences. Practise these words inside text completion and sentence equivalence questions.