1 : to hide (something or someone) from sight
The sunglasses conceal her eyes.
The controls are concealed behind a panel.
The defendant is accused of attempting to conceal evidence.
2 : to keep (something) secret
The editorial accused the government of concealing the truth.
She could barely conceal her anger.
— concealed adjective
He was carrying a concealed [=hidden] weapon.
a concealed compartment
— concealment kənˈsi:lmənt noun [noncount]
concealment of evidence