can I say "phase out" as I mentioned below 👇
Cash has been phasing out.
would you please provide more examples?
用 英語 (美國) 要怎麼說？

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Not like that, exactly. "Cash has been phased out" would work, which means that it's no longer used, or "Cash is currently being phased out" would mean that it's in the process of no longer being used.

The (passive) verb phrase is "to be phased out", so you have to conjugate the entire thing in order for the sentence to be correct. You can say "Cash has been being phased out" if you wanted to use the present perfect continuous, but this sounds awkward so it's better to use another way of phrasing it.