taptap

Verb

 * 1) to hide from view; to mask; to veil

Noun

 * 1) a cover; something used to hide an object from view
 * 2) a mask; a cover, or partial cover, for the face, used for disguise or protection

Etymology
From, eventually without doubt onomatopoetic (like the English equivalents and similar forms in several languages).

Verb

 * 1) to tap, to patter