to hide;  to cover;  to shield;  to shade
To hide one's smiling mouth;  to hide one's mouth and smile
To cover one's face (with one's hands) in shame;  To hide one's face in shame
The cloud hides the moon
To shade one's eyes with one's hand/with a newspaper
To disguise oneself in order to put a cover on the eyes of the secret police;  to disguise oneself in order to pull the wool over the eyes of the police
To use one's body as a shield to protect the President;  To shield the President with one's (own) body
To shield somebody from criticism/punishment/danger