From Middle English sound, sund, isund, ȝesund, from Old English sund, ġesund, from Proto-Germanic *gasundaz, *sundaz, from Proto-Indo-European *sunt-, *swent-.
Cognate with Scots sound, soun, Saterland Frisian suund, gesuund, West Frisian sûn ("healthy"), Dutch gezond ("healthy, sound"), Low German sund, gesund, German gesund ("healthy, sound"), Danish sund ("healthy"), Swedish sund ("sound, healthy"). Related also to Dutch gezwind ("fast, quick"), German geschwind ("fast, quick"), Old English swīþ ("strong, mighty, powerful, active, severe, violent"). See swith.
Noun: from Middle English sownde, alteration of soun, borrowed from Anglo-Norman sun, soun, Old French son, from accusative of Latin sonus, ultimately from Proto-Indo-European *swenh₂- ("to sound, resound").
Verb: from Middle English sownden, sounen, borrowed from Anglo-Norman suner, sounder, Old French soner (modern sonner), from Latin sonō.
The hypercorrect -d appears in the fifteenth century.
Displaced native , from , from .
From Middle English sound, sund, from Old English sund ("the power, capacity, or act of swimming; swimming; sea; ocean; water; sound; strait; channel"), from Proto-Germanic *sundą ("swimming; sound"), from Proto-Indo-European *swem- ("swimming; sea"). Cognate with Dutch zond ("sound; strait"), Danish sund ("sound; strait; channel"), Swedish sund ("sound; strait; channel"), Icelandic sund ("sound; strait; channel"). Related to swim.
From Middle English sounden, from Old French sonder, from sonde of Germanic origin, compare Old English sundgyrd ("a sounding rod"), sundline, Old English sund ("water, sea"). More at Etymology 3 above.
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