stick head above the parapetput/stick (your) head above the parapet
to be brave enough to state an opinion that might upset people.
Kearton was one of the very few to put his head above the corporate parapet and speak his mind in public.
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stick (one's) head above the parapet
To state or defend opinions that may be considered controversial in spite of the risk of receiving unfavorable reactions from others. Thank goodness that someone is willing to stick their head above the parapet and drew customers' attention to the deceitful practices of these corporations.Several senators stuck their heads above the parapet and defended the legislation against their own party.