1. to roll about or wallow in something; to be immersed in or surrounded by something. Most breeds of pigs will welter happily in mud. I hate having to welter in the heat.

2. [for someone or something] to drip or run with liquid, such as blood, sweat, water, etc. Three minutes into the jungle, we were weltering in our own sweat. The wounded man weltered in his blood.

3. Fig. to be immersed in something such as activity, work, demands, etc. (Fig. on {2}.) Toward the peak of the season, we welter in orders for our goods. She was weltering in work, eager to take a break.