snig·ger /ˈsnɪgɚ/
  (vi.)吃吃地竊笑吃吃竊笑,偷偷的笑
  Snick·er v. i. [imp. & p. p. Snickered p. pr. & vb. n. Snickering.]  [Written also snigger.]
  1. To laugh slyly; to laugh in one's sleeve.
  2. To laugh with audible catches of voice, as when persons attempt to suppress loud laughter.
  Snick·er, n. A half suppressed, broken laugh. [Written also snigger.]
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  snigger
       n : a disrespectful laugh [syn: snicker, snort]
       v : laugh quietly [syn: snicker]