To hide the evidence of what you have done.
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To hide the evidence of something you did, so nobody can prove it.
When you cover your tracks, you remove or change the traces you left behind — files, messages, records.
It almost always suggests the person knew they were doing something wrong.
"Sweep Something Under the Rug"
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Hide a problem instead of dealing with it
"Throw Someone Off the Scent"
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Send someone searching the wrong direction
"Cover Your Tracks"
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Hide evidence of what you did