with one voice

US /wɪθ wʌn vɔɪs/
UK /wɪθ wʌn vɔɪs/
"with one voice" picture
1.

if people say or do something with one voice, they all say or do the same thing at the same time

:
The committee spoke with one voice against the proposal.
All the students agreed with one voice to postpone the exam.