You said forfeit means to lose. I used it a s a verb:
<--- Concise Oxford Thesaurus --->
forfeit , , , be deprived of, surrender, relinquish, sacrifice, give up, yield, renounce, forgo; informal pass up, lose out on. Wayne
Words, words, words.
Out of many words, one meaning, and undeniably one result...You ain't got what you once had.
And that's why I believe IF you're truly saved, God will not allow you to rescind what He will not rescind...His "gift" to His Son for His sacrificial death. God so loved the world that He gave... And He kept giving, but now, not just to the world, but to His Son. "All that the Father gives to Me," Jesus said, "shall come to me....and no man can pluck him out of MY hands." I'm not talking about tares, here; they grow with the wheat.
That's why we're compared to sheep. The truly saved may wander, but will eventually be brought back to the fold. And I'm not talking about wolves in sheep's clothing who WILL forfeit -lose-lose out -yield - renounce, et al.
This brings me back to the IF, a crucial part of the discussion, and the one factor that only God and each individual can ultimately know.