It means "hush my little bird"
"Feigele" in Yiddish is a term of endearment that translates to "little bird" in English. It is often used affectionately to refer to someone, especially a child, in a cute or endearing way.
Vladka Meed's birth name is Feigele Peltel.
The cast of Bar-Mitzvah - 1935 includes: Gertrude Bulman as Feigele Anita Chayes as Rosalie Sam Colton as Sam Peter Graf as Cantor Yeruchim Leah Naomi as Sarah Benjamin Schechtman as Yudele Morris Strassberg as Abraham Morris Tarlowsky as Alexander Boris Thomashefsky as Israel Regina Zuckerberg as Leah