weak sister

Noun

US derogatory idiomatic

(chiefly US, idiomatic, derogatory) A person who is cowardly or indecisive. / (chiefly US, idiomatic) A person or thing which is the least robust or least dependable member of a group.

Japanese Meaning

臆病で優柔不断な人。 / 集団の中で最も頼りにならない、もしくは最も弱い存在。

What is this buttons?

Nobody wanted to partner with the weak sister who always backed out at the last minute.

Google Translation / DeepL Translation

いつも土壇場で逃げ出す臆病者とは誰も組みたがらなかった。

Details

Sense（1）

(chiefly US, idiomatic, derogatory) A person who is cowardly or indecisive.

"Your course of action this past year has bordered on criminal negligence," he barks to the man whose job he means to take. "You're a weak sister, Mr. President."

Google Translation / DeepL Translation