The word(s) "back" appears 225 time(s) in 216 verse(s) in Quran in Abdullah Yusuf Ali translation.

(111) So Pharaoh withdrew: He concerted his plan, and then came (back).

(112) (Moses) said: "O Aaron! what kept thee back, when thou sawest them going wrong,

(113) (All) faces shall be humbled before (Him) - the Living, the Self-Subsisting, Eternal: hopeless indeed will be the man that carries iniquity (on his back).

(114) If only the Unbelievers knew (the time) when they will not be able to ward off the fire from their faces, nor yet from their backs, and (when) no help can reach them!

(115) "And by Allah, I have a plan for your idols - after ye go away and turn your backs"..

(116) But if they turn back, Say: "I have proclaimed the Message to you all alike and in truth; but I know not whether that which ye are promised is near or far.

(117) O mankind! if ye have a doubt about the Resurrection, (consider) that We created you out of dust, then out of sperm, then out of a leech-like clot, then out of a morsel of flesh, partly formed and partly unformed, in order that We may manifest (our power) to you; and We cause whom We will to rest in the wombs for an appointed term, then do We bring you out as babes, then (foster you) that ye may reach your age of full strength; and some of you are called to die, and some are sent back to the feeblest old age, so that they know nothing after having known (much), and (further), thou seest the earth barren and lifeless, but when We pour down rain on it, it is stirred (to life), it swells, and it puts forth every kind of beautiful growth (in pairs).

(118) Every time they wish to get away therefrom, from anguish, they will be forced back therein, and (it will be said), "Taste ye the Penalty of Burning!"

(119) As to those who have rejected (Allah), and would keep back (men) from the Way of Allah, and from the Sacred Mosque, which We have made (open) to (all) men - equal is the dweller there and the visitor from the country - and any whose purpose therein is profanity or wrong-doing - them will We cause to taste of a most Grievous Penalty.

(120) He knows what is before them and what is behind them: and to Allah go back all questions (for decision).