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)

不顧唐突…，不揣冒昧…

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

我冒昧問一句，他會有什么樣的要求呢?。

(as) bold as brass

confident to the point of impudence

厚顏無恥，唐突，放肆

she marched into the library as bold as brass.

她非常無禮地大步走進圖書館。

bold stroke

a daring action or initiative

大膽的行動（或倡議）