in·cog·ni·to /ˌɪnˌkɑgˈni(ˌ)to ||ɪnˈkɑgnəˌto/
  (ad.)微行,用假名的微行者,匿名者(a.)微行的,改名的,匿名的
  In·cog·ni·to a. ∨ adv.  Without being known; in disguise; in an assumed character, or under an assumed title; -- said esp. of great personages who sometimes adopt a disguise or an assumed character in order to avoid notice.
  'T was long ago
  Since gods come down incognito.   --Prior.
     The prince royal of Persia came thither incognito.   --Tatler.
  In·cog·ni·to, n.; pl. Incognitos
  1. One unknown or in disguise, or under an assumed character or name.
  2. The assumption of disguise or of a feigned character; the state of being in disguise or not recognized.
     His incognito was endangered.   --Sir W. Scott.
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  incognito
       adj : with your identity concealed [syn: incognito(p)]
       adv : without revealing one's identity; "in Holland he lived
             incognito as a carpenter in the shipyards of the East
             India company"