An example of forfeit is when you give up your day off to make more money. When they were expelled, they had to forfeit their degrees, with grave implications for their professional futures.
To forfeit is to lose by a technicality; for example, if you don't show up for a game, you might be declared to forfeit the game; when a divorced woman remarries, she forfeits her right to alimony payments from the previous husband, etc.
forfeited
Yes, they can forfeit.
If you don't appear in court, you will forfeit your bail.
The prefix of forfeit is "for-", and the suffix is "-feit".
In ordinary usuage, "forfeit" means to relinquish your rights, as in: "I choose to forfeit my rights to the property that I own".
You forfeit your right to choose.
"He would have to forfeit his turn to answer the telephone."
"The man had to forfeit because he knew that there was no way he could win."
After suffering many casualties, the commander had to forfeit the battle.
The practice of plagiarism should mean the forfeit of marks.
The African Luhya translation of the English word 'forfeit' is "Lekhana".