The word(s) "lower" appears 81 time(s) in 80 verse(s) in Quran in Muhammad Habib Shakir translation.

(61) And We delivered him and his followers from the mighty distress.

(62) When We delivered him and his followers, all--

(63) And when they shall contend one with another in the fire, then the weak shall say to those who were proud: Surely we were your followers; will you then avert from us a portion of the fire?

(64) So He ordained them seven heavens in two periods, and revealed in every heaven its affair; and We adorned the lower heaven with brilliant stars and (made it) to guard; that is the decree of the Mighty, the Knowing.

(65) And you shall see them brought before it humbling themselves because of the abasements, looking with a faint glance. And those who believe shall say: Surely the losers are they who have lost themselves and their followers on the resurrection day. Now surely the iniquitous shall remain in lasting chastisement.

(66) And thus, We did not send before you any warner in a town, but those who led easy lives in it said: Surely we found our fathers on a course, and surely we are followers of their footsteps.

(67) And they said: O magician! call on your Lord for our sake, as He has made the covenant with you; we shall surely be the followers of the right way.

(68) Surely those who lower their voices before Allah's Apostle are they whose hearts Allah has proved for guarding (against evil); they shall have forgiveness and a great reward.

(69) And know that among you is Allah's Apostle; should he obey you in many a matter, you would surely fall into distress, but Allah has endeared the faith to you and has made it seemly in your hearts, and He has made hateful to you unbelief and transgression and disobedience; these it is that are the followers of a right way.

(70) Surely We sent upon them a stonestorm, except Lut's followers; We saved them a little before daybreak,