to hide evidence of one’s actions
ocultar evidencia de las acciones de uno (ocultar evidencia de las acciones de uno)
"Hackers often cover their tracks after breaking into systems."
"Los hackers a menudo cubren sus huellas después de entrar en los sistemas." (Los hackers a menudo **cubren sus huellas** después de entrar en los sistemas.)
to feel grateful for good fortune
to start working hard, especially after delaying
don't make plans for something that might not happen
to become less angry or upset
the most advanced or innovative part of something
a person who is the first to do something innovative