ту̑ђ (Serbo-Croatian) comes from Proto-Slavic ťuďь, from Gothic 𐌸𐌹𐌿𐌳𐌰, from Proto-Germanic þeudō, from Proto-Indo-European tewtéh₂, from Proto-Indo-European tewh₂- — to swell; to crowd; to be strong.
ту̑ђ (Serbo-Croatian): foregin