Definitions from Wiktionary (titter)

▸ verb:  To laugh or giggle in a somewhat subdued or restrained way, as from nervousness or poorly-suppressed amusement.
▸ verb:  (obsolete) To teeter; to seesaw.
▸ noun:  A nervous or somewhat repressed giggle.
▸ noun:  (slang, vulgar, chiefly in the plural) A woman's breast.

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