Definition of what (someone) says goes
(Entry 1 of 2)
: people have to do what (someone) requires or demands What she says goes. She's the boss.
what someone says goesidiom (2)
Definition of what someone says goes (Entry 2 of 2)
—used to say that everyone else has to do what a person tells them to doShe's the boss. What she says goes!
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