Dutch zwoel

← Old English swōl (cognate)

← Old English swōliġ (mention)

← German schwül (cognate)

← English sweal (link)

← Middle Low German swûl (derived)

← Middle Low German swôl (mention)

← German Low German swool (cognate)

← Dutch swoel (mention)

→ Dutch zwoelte (suffix)

→ Old Norse svalr (cognate)