Definitions from Wiktionary ( )

▸ noun:  Talk, especially meaningless or unimportant talk.
▸ noun:  The sound of talking.
▸ noun:  The vocalisations of a Eurasian magpie, Pica pica.
▸ noun:  The vocalisations of various birds or other animals.
▸ noun:  An intermittent noise, as from vibration.
▸ noun:  (uncountable) In national security, the degree of communication between suspect groups and individuals, used to gauge the degree of expected terrorist activity.
▸ noun:  (uncountable) The situation where a drill or similar tool vibrates and tears the material rather than cutting it cleanly.
▸ verb:  (intransitive) To talk idly.
▸ verb:  (intransitive, of teeth, machinery, etc.) To make a noise by rapid collisions.
▸ verb:  To utter sounds which somewhat resemble language, but are inarticulate and indistinct.
▸ noun:  One who chats.
▸ noun:  (Internet) A user of chat rooms.

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