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I saw this question asked on the English SE (reproduced accepted answer below as a quote) which indicates that "Whelm" is simply no longer in use. In terms of Young Justice, it's likely meant as a joke/throwaway line to draw attention to an oddity of language rather than anything majorly significant. Whelm is labeled as "archaic" in NOAD, as it has ...


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https://www.merriam-webster.com/dictionary/whelm Whelm is an olde Englyshe verb meaning "to cover" or "overturn". It has fallen out of use in modern linguistics.


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