A child uses the word "doggy" only for his own family's dog, not for other dogs. This is an example of:

Question

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The child's use of the word "doggy" only for his own family's dog and not for other dogs is an example of underextension. Underextension occurs when a child uses a word to refer only to a specific example of a category and not to other examples within that category. In this case, the child is underextending the word "doggy" to refer only to his family's dog and not to other dogs.

A Child Uses the Word "Doggy" Only for His Own