take up the cudgels
US /teɪk ʌp ðə ˈkʌdʒəlz/
UK /teɪk ʌp ðə ˈkʌdʒəlz/

1.
仗義執言, 挺身而出
to defend someone or something vigorously
:
•
She decided to take up the cudgels for her colleague who was unfairly dismissed.
她決定為被不公正解雇的同事仗義執言。
•
It's time for someone to take up the cudgels against this injustice.
是時候有人挺身而出反對這種不公了。