Please see the description of what the request for verification process is for, at the top of this page. The purpose is not fact-checking, but to verify whether a sense meets our criteria for inclusion. "Occurrence in other dictionaries" is not one of our criteria. The word usage is there, not "listing" and was put there very intentionally. Blindly copying from other dictionaries leaves us vulnerable to copyright violations, allegations of copyright violation, Nihilartikels and invalid appeals to authority. Referring to other dictionaries is fine to clarify (or even correct) a definition. But other dictionaries are not valid citations for a request for verification.