to go on (and on) about somebody or something
to keep talking about a certain subject in length, particularly in a way that bores others
[句]
to talk one's ear off
to talk to someone for an extended period of time, particularly in a way that annoys them
[句]
to love the sound of one's own voice
to be excessively fond of making long conversations, regardless of how annoying that might be for others
[句]

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