The word(s) "sighs" appears 3 time(s) in 3 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) O ye who believe! Be not like the Unbelievers, who say of their brethren, when they are travelling through the Earth or engaged in fighting: "If they had stayed with us, they would not have died, or been slain." This that Allah may make it a cause of sighs and regrets in their hearts. It is Allah that gives Life and Death, and Allah sees well all that ye do.

(سورة آل عمران, Aal-i-Imraan, Chapter #3, Verse #156)
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(2) The Unbelievers spend their wealth to hinder (man) from the path of Allah, and so will they continue to spend; but in the end they will have (only) regrets and sighs; at length they will be overcome: and the Unbelievers will be gathered together to Hell;-

(سورة الأنفال, Al-Anfaal, Chapter #8, Verse #36)
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(3) Those who are wretched shall be in the Fire: There will be for them therein (nothing but) the heaving of sighs and sobs:

(سورة هود, Hud, Chapter #11, Verse #106)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)