The word(s) "lost" appears 31 time(s) in 31 verse(s) in Quran in Mohsin Khan translation.

(11) They are those who have lost their ownselves, and their invented false deities will vanish from them.

(12) Thus did We give full authority to Yusuf (Joseph) in the land, to take possession therein, when or where he likes. We bestow of Our Mercy on whom We will, and We make not to be lost the reward of Al-Muhsinun (the good doers - See V.2:112).

(13) They, turning towards them, said: "What is it that you have lost?"

(14) They said: "We have lost the (golden) bowl of the king and for him who produces it is (the reward of) a camel load; and I will be bound by it."

(15) And he turned away from them and said: "Alas, my grief for Yusuf (Joseph)!" And he lost his sight because of the sorrow that he was suppressing.

(16) They said: "Are you indeed Yusuf (Joseph)?" He said: "I am Yusuf (Joseph), and this is my brother (Benjamin). Allah has indeed been gracious to us. Verily, he who fears Allah with obedience to Him (by abstaining from sins and evil deeds, and by performing righteous good deeds), and is patient, then surely, Allah makes not the reward of the Muhsinun (good-doers - see V.2:112) to be lost."

(17) And keep yourself (O Muhammad صلى الله عليه وسلم) patiently with those who call on their Lord (i.e. your companions who remember their Lord with glorification, praising in prayers, and other righteous deeds) morning and afternoon, seeking His Face; and let not your eyes overlook them, desiring the pomp and glitter of the life of the world; and obey not him whose heart We have made heedless of Our Remembrance, and who follows his own lusts, and whose affair (deeds) has been lost.

(18) Verily as for those who believed and did righteous deeds, certainly We shall not make the reward of anyone who does his (righteous) deeds in the most perfect manner to be lost.

(19) Then, there has succeeded them a posterity who have given up As-Salat (the prayers) [i.e. made their Salat (prayers) to be lost, either by not offering them or by not offering them perfectly or by not offering them in their proper fixed times] and have followed lusts. So they will be thrown in Hell.

(20) So We answered his call, and We removed the distress that was on him, and We restored his family to him (that he had lost) and the like thereof along with them as a mercy from Ourselves and a Reminder for all those who worship Us.