Simple past tense and past participle of welter.(verb)
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Use "weltered" in a sentence
"Distant reeds cast stilettos of shadow as the sun weltered red and swollen behind them."
"His beady black eyes actually weltered in some fluid as he eyed my nose and its little glint of bling."
"For spouts of wild fury dashed up into the clouds; and the shore, wherever any sight of it was left, weltered in a sadly frothsome state, like the chin of a Titan with a lather-brush at work."