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Etymology

Compare (with different vocalism) Ukrainian му́кати (múkaty, “to moo”), Bulgarian муча́ (mučá, “to moo”), also му́кам (múkam), Serbo-Croatian му́кати (“to moo”) (1sg. му̑че̄м), Slovene múkati (“to moo”), Czech mukati (“to moo”), Upper Sorbian mučeć (“to moo”), and more distantly Lithuanian mū̃kia (“it moos”), Ancient Greek μῡκάομαι (mūkáomai, “to moo, to roar”), Middle High German mūhen (“to moo”), also mugen, Middle Low German mucken (“to be quietly indignant”), Ancient Greek μυγμός (mugmós, “sigh”), μύζω (múzō, “to groan, to moo”), Latin mūgiō (“to moo”) (infinitive mūgīre), Sanskrit मुञ्जति (múñjati, “to make a sound”), also मोजति (mṓjati), Hittite [script needed] (mūgāi-, “to lament, to resist”), etc. Ultimately onomatopoeic.