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To pour or gush forth (from or out of something). Sewage began welling out from the spot where the crew had struck the exposed pipe. The tears kept welling out of her eyes.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
well out (of something)
to gush out of something. I opened the door and the water welled out.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.