He declared a forfeit.

We forfeited the game.

Witness, ye ashes of our comrades dear, / ye flames of Troy, that in your hour of woe / nor darts I shunned, nor shock of Danaan spear. / If Fate my life had called me to forego, / this hand had earned it, forfeit to the foe.

He forfeited his health.

Tom bought his car at a forfeiture auction.

The team had to forfeit the match due to lack of players.

Forfeiture of your assets is the last thing you should be worried about.

His health was the forfeit of heavy drinking.

I turn to you, Mr. Holmes, as absolutely my last hope. If you fail me, then my honour as well as my position are forever forfeited.

Thieving is thieving," said the Beast, "whether it be a rose or a diamond; thy life is forfeit."