To offer honest and earnest advice to a superior, even if it means risking their displeasure or directly offending them; to courageously remonstrate with a person of authority.
面对团队领导的错误决定，小张鼓起勇气，犯颜苦谏，最终使项目得以纠正。
Faced with the team leader's mistaken decision, Xiao Zhang plucked up courage and offered earnest and direct advice, which ultimately led to the project's correction.
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