Adverse Agency Action Law and Legal Definition

According to 4 CFR 21.0 [Title 4 Accounts; Chapter I Government Accountability Office; Subchapter B General Procedures; Part 21 Bid Protest Regulations], adverse agency action means any action or inaction by an agency that is prejudicial to the position taken in a protest filed with the agency, including a decision on the merits of a protest; the opening of bids or receipt of proposals, the award of a contract, or the rejection of a bid or proposal despite a pending protest; or contracting agency acquiescence in continued and substantial contract performance.