In the passage, Amanda nags her son Tom for not properly chewing his food and for sleeping.
Nagging is a repetitious act of harassing someone to do something. It is an act of complaining, criticizing or even grumbling over something or somebody.
In the passage, Amanda is an overprotective mum who wants the best for her children. She constantly nags about things like a proper way of chewing food. She urges her daughter to make careful choices when she's choosing a partner and avoid serious mistakes as she did.
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