Lose

Etymology

The triliteral root khā sīn rā (خ س ر), according to corpus.quran.com, occurs in the Quran 65 times.

In the Quran

(35:39) He is the One who made you successors on the earth. Subsequently, whoever rejects, then to him is his rejection. The rejection of those who do not appreciate only increases their Lord's abhorrence towards them. The rejection of those who do not appreciate only increases their loss (Arab. خَسَارًا, khasāran).

Losers

(2:121) Those whom We have given the book and they recite it truthfully the way it deserves to be recited. They trust it. As for those who do not appreciate it, they are the losers (Arab. الْخَاسِرُونَ, l-khāsirūna).

(58:19) The devil has overtaken them, and has caused them to forget the methodology of God. These are the party of the devil. Absolutely, the party of the devil are the losers (Arab. الْخَاسِرُونَ, l-khāsirūna).