Old English wealwian "to roll," from West Germanic *walwon, from PIE root *wel- (3) "to turn, revolve." Figurative sense of "to plunge and remain in some state or condition" is attested from early 13c. Related: Wallowed; wallowing. The noun is recorded from 1590s as "act of rolling;" 1841 as "place where an animal wallows."
wallow in your sorrows
pigs were wallowing in the mud
wallow in your success!
a good wallow in the water
walleye
wall-eyed
wallflower
Walloon
wallop
wallow
wallpaper
wally
walnut
Walpurgis night
walrus