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

(201) If ye two turn in repentance to Him, your hearts are indeed so inclined; But if ye back up each other against him, truly Allah is his Protector, and Gabriel, and (every) righteous one among those who believe,- and furthermore, the angels - will back (him) up.

(202) Again turn thy vision a second time: (thy) vision will come back to thee dull and discomfited, in a state worn out.

(203) Inviting (all) such as turn their backs and turn away their faces (from the Right).

(204) Then he turned back and was haughty;

(205) That Day will Man be told (all) that he put forward, and all that he put back.

(206) In the thought that some back-breaking calamity was about to be inflicted on them;

(207) Further, he turned his back, striving hard (against Allah).

(208) (Then) shall each soul know what it hath sent forward and (what it hath) kept back.

(209) Will not the Unbelievers have been paid back for what they did?

(210) But he who is given his Record behind his back,-