Where does “sounder” come from?

Sounder comes from Old English ġesundra, from Old French sonder, from Proto-Germanic sundą meaning to swim, ultimately from Proto-Indo-European swem-.

sounder (English): comparative form of sound: more sound; Something,...

Definitions

  1. comparative form of sound: more sound; Something,...

Ancestry of “sounder”, step by step

sounder traces back through two separate lines of ancestry.

via French sonder

StepLanguageWordMeaning
1Frenchsonderto probe; to survey and take measurements using a...
2Middle Frenchsonder
3Old Frenchsonderto plumb
4Old Frenchsondesounding line
5Old Englishsundswimming; sea, water
6Old Norsesundswimming; strait, sound; swimming, sound
7Proto-Germanicsundąswimming; sound, strait
8Proto-Germanicswimmanąto be unsteady; to swim; float
9Proto-Indo-Europeanswem(bʰ)-to bend, turn, swing; to be unsteady, move, swim

via Middle English soundar

StepLanguageWordMeaning
1Middle EnglishsoundarAlternative form of sounere
Every word from Proto-Indo-European swem(bʰ)-Every word from Proto-Germanic swimmanąEvery word from Proto-Germanic sundą