Subtractive bilingualism describes the process of losing one's first language when adding a second one.

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Subtractive bilingualism is a phenomenon where a person may lose fluency in their first language while learning a second language. This can happen if the person is not provided with enough opportunities to practice and use their first language, or if they are actively discouraged from using it.

Subtractive Bilingualism Describes the Process of Losing One's First Language