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Speak out
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Meaning:
Talk openly and freely
Example:
People are afraid to SPEAK OUT in oppressive political regimes.
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Speak to
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Meaning:
Comment, make a statement
Example:
The secrecy SPEAKS TO the importance of the documents.
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Speak up
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Meaning:
Talk more loudly
Example:
They couldn't hear the speaker and asked him to SPEAK UP a bit.