To prevent something from being seen or known about. (Cambridge Dictionary)
To prevent disclosure or recognition of. (Merriam – Webster)
To place out of sight. (Merriam – Webster)
If you conceal something, you cover it or hide it carefully. (Collins Dictionary)
Not allow to be seen; hide. (Oxford Dictionaries)
Schumacher family right to conceal medical condition – Brawn.
How to conceal under eye circles with Master Camo