mother tongue
英 [ˌmʌðə ˈtʌŋ]
美 [ˌmʌðər ˈtʌŋ]
n. 母语; 本国语
牛津词典
noun
- 母语；本国语
the language that you first learn to speak when you are a child
柯林斯词典
- 母语;本国语;本族语
Yourmother tongueis the language that you learn from your parents when you are a baby.
英英释义
noun
- one's native language