To Mask

1. (transitive) To cover (the face or something else), in order to conceal the identity or protect against injury; to cover with a mask or visor.
2. (transitive) To disguise as something else.
3. (transitive) To conceal from view or knowledge; to cover; to hide.
4. (transitive, military) To conceal; also, to intervene in the line of.
5. (transitive, military) To cover or keep in check.
6. (intransitive) To take part as a masker in a masquerade.
7. (intransitive) To wear a mask.
8. (intransitive, obsolete) To disguise oneself, to be disguised in any way.
9. (intransitive) To conceal or disguise one's autism.
10. (transitive) to cover or shield a part of a design or picture in order to prevent reproduction or to safeguard the surface from the colors used when working with an air brush or painting
11. (transitive, computing) To set or unset (certain bits, or binary digits, within a value) by means of a bitmask.
12. (transitive, computing) To disable (an interrupt, etc.) by setting or unsetting the associated bit.