Translation

激しい批判 / 非難 / 反発

Meaning

Flak is strong criticism, blame, or hostile reaction, especially after a public decision or mistake. It is often used with take, get, catch, or face.

Examples

• 会社は価格変更で激しい批判を受けました。
  The company took flak for the price change.
• 市長は新しい計画をめぐって反発に直面しました。
  The mayor faced flak over the new plan.