The word(s) "diminish" appears 8 time(s) in 8 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) O you who believe! when you deal with each other in contracting a debt for a fixed time, then write it down; and let a scribe write it down between you with fairness; and the scribe should not refuse to write as Allah has taught him, so he should write; and let him who owes the debt dictate, and he should be careful of (his duty to) Allah, his Lord, and not diminish anything from it; but if he who owes the debt is unsound in understanding, or weak, or (if) he is not able to dictate himself, let his guardian dictate with fairness; and call in to witness from among your men two witnesses; but if there are not two men, then one man and two women from among those whom you choose to be witnesses, so that if one of the two errs, the second of the two may remind the other; and the witnesses should not refuse when they are summoned; and be not averse to writing it (whether it is) small or large, with the time of its falling due; this is more equitable in the sight of Allah and assures greater accuracy in testimony, and the nearest (way) that you may not entertain doubts (afterwards), except when it is ready merchandise which you give and take among yourselves from hand to hand, then there is no blame on you in not writing it down; and have witnesses when you barter with one another, and let no harm be done to the scribe or to the witness; and if you do (it) then surely it will be a transgression in you, and be careful of (your duty) to Allah, Allah teaches you, and Allah knows all things.

(2) And to Madyan (We sent) their brother Shu'aib. He said: O my people! serve Allah, you have no god other than Him; clear proof indeed has come to you from your Lord, therefore give full measure and weight and do not diminish to men their things, and do not make mischief in the land after its reform; this is better for you if you are believers:

(3) Therefore be not in doubt as to what these worship; they do not worship but as their fathers worshipped before; and most surely We will pay them back in full their portion undiminished.

(4) Give a full measure and be not of those who diminish;

(5) And Allah created you of dust, then of the life-germ, then He made you pairs; and no female bears, nor does she bring forth, except with His knowledge; and no one whose life is lengthened has his life lengthened, nor is aught diminished of one's life, but it is all in a book; surely this is easy to Allah.

(6) The dwellers of the desert say: We believe. Say: You do not believe but say, We submit; and faith has not yet entered into your hearts; and if you obey Allah and His Apostle, He will not diminish aught of your deeds; surely Allah is Forgiving, Merciful.

(7) We know indeed what the earth diminishes of them, and with Us is a writing that preserves.

(8) And (as for) those who believe and their offspring follow them in faith, We will unite with them their offspring and We will not diminish to them aught of their work; every man is responsible for what he shall have wrought.