be (或 make) so bold (as to do something)

(formal)dare to do something (often used when politely asking a question or making a suggestion)

不顾唐突…，不揣冒昧…

what would he be calling for, &B{if I might make so bold} as to ask?.

我冒昧问一句，他会有什么样的要求呢?。

(as) bold as brass

confident to the point of impudence

厚颜无耻，唐突，放肆

she marched into the library as bold as brass.

她非常无礼地大步走进图书馆。

bold stroke

a daring action or initiative

大胆的行动（或倡议）