cover one's tracks

引用からどうぞ。


I never admitted to myself I had a problem. I married my boyfriend in 2010 and I’d cover my tracks by hiding the empty bottles in my closet. My husband, a photographer, worked mostly nights, so our schedules were rarely in sync.
(Jane Ridley. A drunk blog post saved my life. New York Post. March 31, 2016.)


短い引用なのでコンテクストがよく分からないかもしれませんが、ここで"a problem"とはアルコール依存症のことです。

"cover one's tracks"という成句について見てみたいと思います。

辞書にも載っていますが、（自身の行動の）足跡を隠す、という意味の成句です。"track(s)"とは、歩いたり、車両で通ったりしたあとにできる跡、「轍（わだち）」を意味します。

もう少し用例を見て見たいと思います。


It's difficult to know precisely how much cyber espionage by Russia had gone undetected in the past? Russian hackers have gone to great lengths to cover their tracks, unlike their counterparts in China, who have generally been easier to detect, said Alan Paller, a cyber security expert at the SANS Institute.
(Pittsburg Post-Gazette. 2014.)


隠すというからには元々の意図に良からぬものがあるからということですね。