says who?
US /ˈsɛz huː/
UK /ˈsɛz huː/

1.
誰說的?, 誰說的算?
used to express doubt or disagreement with a statement, implying that the source of the information is questionable or lacks authority
:
•
You can't do that. Says who?
你不能那樣做。誰說的?
•
They told me I'm not allowed to enter. Says who?
他們告訴我不能進去。誰說的?