stir up

phrasal verb·1 sense·particle up

Meanings

1

Cause strong feelings or trouble deliberately

Why “up”? Something normal is disturbed. Feelings, systems, machines, or behavior become noisy, troubled, or out of control.

He stirred up bad memories.
He caused bad memories to surface.
The speech stirred up anger in the crowd.
The speech caused anger in the crowd.

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He stirred up bad memories. What does it mean?

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