rattle away meaning

[American slang]
to chatter endlessly and aimlessly.
  The two old men sat there and rattled away at one another.
  Tom rattled away at Jane for a few minutes and then left the house.

Examples

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1. the gun rattled away.
2. once she started to talk about herself, she would rattle away for a long time.
3. exclaimed she, rattling away at the instrument
4. the child rattled away merrily
5. the ox-cart rattled away