Speak now or forever hold your peace

Meaning

A formal way to ask for final input before a decision is made or a window of opportunity closes. It is a slightly dramatic way to insist that someone voice their concerns immediately.

Formal, dramatic

Used in a sentence

• If anyone has a better way to organize this file system, speak now or forever hold your peace.
• I am sending the email in five minutes, so speak now or forever hold your peace.
• We are ordering lunch now, so speak now or forever hold your peace about the menu.