speak with one voice

to express the same opinion It is a very rare event when my family speaks with one voice about anything.

Usage notes: must refer to two or more people, as in the example

Name	Pronounced	Usage
Cece	SEE-see	English
Leonor	-	Spanish, Portuguese
Zaira	dzah-EE-rah	Italian
SevİL	-	Turkish
Jowita	yaw-VEE-tah	Polish
Leoffl&Aelig;D	-	Anglo-Saxon