titter

higher level
| subject: Laughing sounds
to laugh nervously, often at something that you feel you should not be laughing at
/ˈtɪt.ər/
A couple of the younger teachers tittered at his smutty jokes.SOUND: http://www.soundsnap.com/male_thirty_year_old_laughing_with_a_titter_while_exhaling
chichotać, podśmiewać się
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