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titter  (titters plural & 3rd person present) (tittering present participle) (tittered past tense & past participle )If someone titters, they give a short nervous laugh, especially when they are embarrassed about something.  verb  (=snigger) 
Mention sex therapy and most people will titter in embarrassment.  V 
  Titter is also a noun., n-count 
Mollie gave an uneasy little titter.  
 tittering  n-uncount 
There was nervous tittering in the studio audience.