The word(s) "understand" appears 127 time(s) in 127 verse(s) in Quran in Abdullah Yusuf Ali translation.

(41) "O my people! I ask of you no reward for this (Message). My reward is from none but Him who created me: Will ye not then understand?

(42) They said: "O Shu'aib! much of what thou sayest we do not understand! In fact among us we see that thou hast no strength! Were it not for thy family, we should certainly have stoned thee! for thou hast among us no great position!"

(43) "If not Him, ye worship nothing but names which ye have named,- ye and your fathers,- for which Allah hath sent down no authority: the command is for none but Allah: He hath commanded that ye worship none but Him: that is the right religion, but most men understand not...

(44) "O Joseph!" (he said) "O man of truth! Expound to us (the dream) of seven fat kine whom seven lean ones devour, and of seven green ears of corn and (seven) others withered: that I may return to the people, and that they may understand."

(45) And he raised his parents high on the throne (of dignity), and they fell down in prostration, (all) before him. He said: "O my father! this is the fulfilment of my vision of old! Allah hath made it come true! He was indeed good to me when He took me out of prison and brought you (all here) out of the desert, (even) after Satan had sown enmity between me and my brothers. Verily my Lord understandeth best the mysteries of all that He planneth to do, for verily He is full of knowledge and wisdom.

(46) Nor did We send before thee (as messengers) any but men, whom we did inspire,- (men) living in human habitations. Do they not travel through the earth, and see what was the end of those before them? But the home of the hereafter is best, for those who do right. Will ye not then understand?

(47) There is, in their stories, instruction for men endued with understanding. It is not a tale invented, but a confirmation of what went before it,- a detailed exposition of all things, and a guide and a mercy to any such as believe.

(48) And in the earth are tracts (diverse though) neighbouring, and gardens of vines and fields sown with corn, and palm trees - growing out of single roots or otherwise: watered with the same water, yet some of them We make more excellent than others to eat. Behold, verily in these things there are signs for those who understand!

(49) Is then one who doth know that that which hath been revealed unto thee from thy Lord is the Truth, like one who is blind? It is those who are endued with understanding that receive admonition;-

(50) Here is a Message for mankind: Let them take warning therefrom, and let them know that He is (no other than) One Allah: let men of understanding take heed.