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
Sapphira	sə-FIE-rə (English)	Biblical
Seema	-	Indian, Hindi, Marathi
Mario	['mæriəu]
Osku	OS-koo	Finnish
Vulfgang	-	Ancient Germanic
Chiranjeevi	-	Indian, Hindi, Telugu