a voice in the wilderness
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(lone) voice in the wilderness
One who expresses an unpopular opinion or idea. She felt like a voice in the wilderness as she tried to warn others about the impending economic collapse. He was a lone voice in the wilderness as he tried to expose the vast corruption within the organization.
a voice in the wildernessan unheeded advocate of reform.
The phrase was originally used with reference to the words of John the Baptist, who proclaimed the coming of the Messiah: ‘I am the voice of one crying in the wilderness’ (John 1:23).