Final answer:
Overgeneralization is when a language rule is extended to an exception. It is commonly seen in children's language development.
Step-by-step explanation:
In English, overgeneralization refers to an extension of a language rule to an exception to the rule. This is commonly seen in children's language development. For example, the rule for pluralizing words is to add an 's' to the end of a word, but young children may overgeneralize this rule and say 'gooses' or 'mouses' instead of 'geese' or 'mice'.