How to unlink my Outlook account and my Gmail account?

A while back, I linked these accounts together somehow (it's been so long I forgot how) so I would only have to access one account to read all my email, but now when I get an email in my Gmail account, I get that exact same email in my Outlook account a few minutes later, and I keep getting notification noises on my iPhone and have to spend time deleting the extra emails. It's really annoying me and I want to undo it, but I don't know how!

In Gmail, remove permission for Outlook to fetch your mail. Or in Outlook Options, just "remove" the Gmail account. Both actions will unlink them. ☼

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