Simple past tense and past participle of well.(verb)
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Use "welled" in a sentence
"The word welled up as a growl, low and rumbling from a squat, muscular man."
"Like, with every fiber of my being, and my eyes kind of welled up because it was overwhelming."
"Sitting in the Sinai Memorial Chapel, listening to the haunting kaddish, I considered: What happens to all that energy of grief Larry’s phrase welled from memory when people have no way to give it voice?"