The word(s) "threat" appears 20 time(s) in 20 verse(s) in Quran in Mohsin Khan translation.

(11) So that they become ingrate for that which We have given them, and that they take their enjoyment (as a warning and a threat), but they will come to know.

(12) And a believing man of Fir'aun's (Pharaoh) family, who hid his faith said: "Would you kill a man because he says: My Lord is Allah, and he has come to you with clear signs (proofs) from your Lord? And if he is a liar, upon him will be (the sin of) his lie; but if he is telling the truth, then some of that (calamity) wherewith he threatens you will befall on you." Verily, Allah guides not one who is a Musrif (a polytheist, or a murderer who shed blood without a right, or those who commit great sins, oppressor, transgressor), a liar!

(13) Verily, those who turn away from Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc. by attacking, distorting and denying them) are not hidden from Us. Is he who is cast into the Fire better or he who comes secure on the Day of Resurrection? Do what you will. Verily He is All-Seer of what you do (this is a severe threat to the disbelievers ).

(14) Or (if) We show you that wherewith We threaten them: then verily We have perfect command over them.

(15) They said: "Have you come to turn us away from our alihah (gods)? Then bring us that with which you threaten us, if you are one of the truthful!"

(16) Therefore be patient (O Muhammad صلى الله عليه وسلم) as did the Messengers of strong will and be in no haste about them (disbelievers). On the Day when they will see that (torment) with which they are promised (i.e. threatened, it will be) as if they had not stayed more than an hour in a single day. (O mankind! this Qur'an is sufficient as) a clear Message (or proclamation to save yourself from destruction). But shall any be destroyed except the people who are Al-Fasiqun (the rebellious against Allah's Command, the disobedient to Allah)?

(17) And the Dwellers of the Wood, and the people of Tubba'. Everyone of them denied (their) Messengers, so My threat took effect.

(18) Allah will say: "Dispute not in front of Me, I had already in advance sent you the threat.

(19) We know best what they say. And you (O Muhammad صلى الله عليه وسلم) are not the one to force them (to Belief). But warn by the Qur'an; him who fears My threat.

(20) The people of Nuh (Noah) denied (their Messenger) before them. They rejected Our slave, and said: "A madman!" and he was insolently rebuked and threatened.