activity - any specific activity; "they avoided all recreational activity"

disguise, camouflage - the act of concealing the identity of something by modifying its appearance; "he is a master of disguise"

mask - activity that tries to conceal something; "no mask could conceal his ignorance"; "they moved in under a mask of friendship"

masking, screening, cover, covering - the act of concealing the existence of something by obstructing the view of it; "the cover concealed their guns from enemy aircraft"

cover - a false identity and background (especially one created for an undercover agent); "her new name and passport are cover for her next assignment"

cover-up - concealment that attempts to prevent something scandalous from becoming public

burying, burial - concealing something under the ground

smoke screen, smokescreen - an action intended to conceal or confuse or obscure; "requesting new powers of surveillance is just a smokescreen to hide their failures"

stealth, stealing - avoiding detection by moving carefully

money laundering - concealing the source of illegally gotten money