Definitions of welter:

• noun:   a confused multitude of things
• verb:   toss, roll, or rise and fall in an uncontrolled way

  Example: "The shipwrecked survivors weltered in the sea for hours"

• verb:   be immersed in

  Example: "Welter in work"

• verb:   roll around, "pigs were wallowing in the mud"
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #8154)