довгъ

• долгъ (dolh) — archaic form; дулгъ (dulh)
• довъгъ (dovh), долъгъ (dolh) – alternative spelling
• длъ́гъ (dloh) – borrowed from Old Church Slavonic
• длукгъ (dlug), длуґъ (dlug) – borrowed from Old Polish
• длухъ (dlux) – borrowed from Old Czech

From early до́лгъ (dólh), inherited from Old East Slavic дъ́лгъ (dŭ́lgŭ), from Proto-Slavic *dъlgъ, borrowed from Gothic 𐌳𐌿𐌻𐌲𐍃 (dulgs), from Proto-Germanic *dulgaz, from Proto-Indo-European *dʰl̥gʰ-os, from *dʰelgʰ-. Cognate with Russian долг (dolg).

довгъ • (dovh) m inan

1. debt
2. duty

• Belarusian: доўг (doŭh)
• Carpathian Rusyn: довг (dovh)
• Ukrainian: довг (dovh) (dialectal)

• Tymchenko, E. K., editor (1932), “длуґъ”, in Історичний словник українського язика [Historical Dictionary of the Ukrainian Language] (in Ukrainian), volume 1, issue 2 (Г – Ж), Kharkiv, Kyiv: Ukrainian Soviet Encyclopedia, page 725
• Tymchenko, E. K., editor (1932), “довгъ”, in Історичний словник українського язика [Historical Dictionary of the Ukrainian Language] (in Ukrainian), volume 1, issue 2 (Г – Ж), Kharkiv, Kyiv: Ukrainian Soviet Encyclopedia, page 744
• Tymchenko, E. K., editor (1932), “долгъ”, in Історичний словник українського язика [Historical Dictionary of the Ukrainian Language] (in Ukrainian), volume 1, issue 2 (Г – Ж), Kharkiv, Kyiv: Ukrainian Soviet Encyclopedia, page 770
• Hrynchyshyn, D. H., editor (1977), “*длъгъ”, in Словник староукраїнської мови XIV–XV ст. [Dictionary of the Old Ukrainian Language of the 14ᵗʰ–15ᵗʰ cc.] (in Ukrainian), volume 1 (А – М), Kyiv: Naukova Dumka, page 301
• Hrynchyshyn, D. H., editor (1977), “*долгъ”, in Словник староукраїнської мови XIV–XV ст. [Dictionary of the Old Ukrainian Language of the 14ᵗʰ–15ᵗʰ cc.] (in Ukrainian), volume 1 (А – М), Kyiv: Naukova Dumka, page 314
• Hrynchyshyn, D. H., editor (2001), “длугъ, длухъ”, in Словник української мови XVI – 1-ї пол. XVII ст. [Dictionary of the Ukrainian Language of 16ᵗʰ – 1ˢᵗ half of 17ᵗʰ c.] (in Ukrainian), issue 8 (десѧтинный – дѣдичство), Lviv: KIUS, →ISBN, page 34
• Hrynchyshyn, D. H., editor (2001), “долгъ¹, долгь, долъгъ, дольгь, длъгъ, длъгь, дулгъ, довгъ, довъгъ”, in Словник української мови XVI – 1-ї пол. XVII ст. [Dictionary of the Ukrainian Language of 16ᵗʰ – 1ˢᵗ half of 17ᵗʰ c.] (in Ukrainian), issue 8 (десѧтинный – дѣдичство), Lviv: KIUS, →ISBN, page 106
• Zhurawski, A. I., editor (1987), “долгъ, довгъ”, in Гістарычны слоўнік беларускай мовы [Historical Dictionary of the Belarusian Language] (in Belarusian), issue 8 (девичий – дорогость), Minsk: Navuka i tekhnika, page 249
• Zhurawski, A. I., editor (1987), “длугъ, длукгъ”, in Гістарычны слоўнік беларускай мовы [Historical Dictionary of the Belarusian Language] (in Belarusian), issue 8 (девичий – дорогость), Minsk: Navuka i tekhnika, page 109
• Tymchenko, E. K. (2002), “довгъ”, in Nimchuk, V. V., editor, Матеріали до словника писемної та книжної української мови XV–XVIII ст. [Materials for the Dictionary of the Written and Book Ukrainian Language of 15ᵗʰ–18ᵗʰ cc.] (in Ukrainian), volume 1 (А – Н), Kyiv, New York: National Academy of Sciences of Ukraine, Ukrainian Academy of Arts and Sciences in the U.S., →ISBN, page 213