cover (one's) tracks (up)

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cover (one's) tracks (up)

1. Literally, to conceal one's footprints, typically to avoid being followed. Those hounds can track us across rivers, so covering our tracks won't do any good.
2. To conceal the evidence of one's (usually nefarious) actions. We need to cover our tracks before someone traces the bank robbery back to us. I destroyed those incriminating documents to cover my tracks up.
See also: cover, track