cover one's tracks[cover one's tracks] or [cover up one's tracks] {v. phr.}
1. To hide and not leave anything, especially foot marks, to show where you have been, so that no one can follow you.
2. {informal} To hide or not say where you have been or what you have done; not tell why you do something or what you plan to do.
Compare: COVER UP(1). Source: A Dictionary of American Idioms
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