hold a brief for

(Brit.)be retained as counsel for

(英)受聘為…辯護，當…的辯護律師

hold no brief for

not support or argue in favour of

不支持，不為…辯護

I hold no brief for dishonest policemen.

我不為不誠實的警察辯護。

in brief

In short.

簡而言之