mask definition

1. a covering to disguise or conceal the face
2. activity that tries to conceal something
• examples: no mask could conceal his ignorance
• examples: they moved in under a mask of friendship
3. a protective covering worn over the face
4. put a mask on or cover with a mask
• examples: Mask the children for Halloween
5. cover with a sauce
• examples: mask the meat
6. shield from light