cover one's tracks

verb2

1. •
   (figurative) To conceal how one has arrived at a certain result or position.

   • C.I.E. Class "D14" 4-4-0 No. 89 covers its tracks with a magnificent smokescreen as it pulls out of Dun Laoghaire with the 9.0 a.m. boat train for Dublin. [in this case, railway tracks] — 1959
2. •
   (figurative) To conceal, hide or destroy evidence of one's actions or identity.