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top-off

[top-awf, -of]
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noun Australian Slang.
  1. a person who informs on another, often as if by accident or as a joke.
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Origin of top-off

First recorded in 1940–45; noun use of verb phrase top off to inform (on someone)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018