To defy public opinion and do something highly disapproved of; to fly in the face of widespread condemnation or popular judgment.
他明知公司规定不允许，却冒大不韪，私自泄露了客户资料，最终受到了严厉处罚。
He knew company regulations forbade it, but he defied strong disapproval by privately disclosing customer data, eventually facing severe penalties.
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