"Welter" is a word in ENGLISH

To roll, as the body of an animal; to tumble about,
especially in anything foul or defiling; to wallow.

To rise and fall, as waves; to tumble over, as billows.

A rising or falling, as of waves; as, the welter of the
billows; the welter of a tempest.

That in which any person or thing welters, or wallows;
filth; mire; slough.

To wither; to wilt.

Of, pertaining to, or designating, the most heavily
weighted race in a meeting; as, a welter race; the welter stakes.