suds: [16] Suds was probably borrowed from Middle Dutch sudse ‘marsh, swamp’ (it was used in the East Anglian dialect for ‘muddy swamp water’ or ‘flood water’, and probably the notion of scum or flotsam on such water led on to ‘floating bubbles, lather’ – first recorded at the end of the 15th century). The word’s ultimate source is no doubt the prehistoric Germanic base *suth- ‘boil’, which also produced English seethe and sodden. => seethe, sodden
