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Related to for one: for one thing
for (someone or something)
Supporting or approving of someone or something. Can you believe he's for building that new shopping center right in the middle of town?
Used after a name or personal pronoun to emphasize something about oneself or someone. The phrase is more formally set apart by commas on either side, but these are often omitted in everyday writing. I can tell you that I for one am really happy about the changes to the tax law they've introduced. A: "Who is coming to the movie later?" B: "Mary, for one, but I haven't heard back from anyone else."
Also, for one thing. As the first of several possible instances. For example, Everything seemed to go wrong; for one, we had a flat tire, and then we lost the keys, or I find many aspects of your proposal to be inadequate; for one thing, you don't specify where you'll get the money . For one can also be applied to a person, as in He doesn't like their behavior, and I for one agree with him.