at one's mother's knee
US /æt wʌnz ˈmʌðərz niː/
UK /æt wʌnz ˈmʌðərz niː/

1.
從小, 在母親膝下
from a very early age; from childhood
:
•
He learned to play the piano at his mother's knee.
他從小就學會了彈鋼琴。
•
She was taught good manners at her mother's knee.
她從小就被教導要有良好的舉止。