What is the difference between "speak out" and "speak up"??

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I think Speak Up : used to ask someone to speak louder.
EX : Could you speak up, please?

Speak Out : to publicly speak in protest about something, especially when protesting could be dangerous.
EX : students who had spoken out against the regime were arrested.

Answer

Speaking up is also when you speak out about something you care a lot about.

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When Should Customers Speak Up and/or Speak Out? Is there a difference?

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