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From The Collaborative International Dictionary of English v.0.48:
Natter \Nat"ter\, v. i. [Cf. Icel. knetta to grumble.] 1. To find fault; to be peevish. [Prov. Eng. or Scot.] [1913 Webster] 2. To talk constantly; to chatter incessantly to prattle; as, nattering like a chatterbox. [PJC]