If you conceal something, you cover it or hide it carefully. Frances decided to conceal the machine behind a hinged panel Five people were arrested for carrying concealed weapons
To hide or withdraw from observation; to cover; to cover or keep from sight; to prevent the discovery of; to withhold knowledge of
If you conceal a piece of information or a feeling, you do not let other people know about it. Robert could not conceal his relief She knew at once that he was concealing something from her. reveal