mother tongue
US /ˈmʌð.ər ˌtʌŋ/
UK /ˈmʌð.ər ˌtʌŋ/
1.
langue maternelle
the language that a person has grown up speaking from childhood; the native language of a person or a group of people
:
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English is my mother tongue, but I also speak French fluently.
L'anglais est ma langue maternelle, mais je parle aussi couramment le français.
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Learning a new language is easier if you have a strong foundation in your mother tongue.
Apprendre une nouvelle langue est plus facile si vous avez une base solide dans votre langue maternelle.