The phrase "welled forth" refers to a sudden and abundant outpouring or gushing of liquid, emotions or sound. Antonyms for this phrase could include terms such as "trickled slowly," "dried up," "stopped flowing," or "ebbed away." To convey the opposite of "welled forth" might also require context-specific synonyms, such as "withdrew," "retreated," or "subsided," depending on the situation being described. It's important to consider the broader meaning of the text or speech to convey the most accurate and meaningful antonyms for this particular phrase, in order to help readers or listeners better comprehend the intended message.