1. strong criticism or opposition
Usage: informal
2. anti-aircraft gunfire or the explosive shells fired by anti-aircraft guns
Usage: military

Examples

• The mayor took a lot of flak for raising taxes.
• She caught flak from her parents for staying out late.
• The new policy generated serious flak from voters.
• The bomber flew through heavy flak over the target.
• Pilots had to navigate through dangerous flak during the mission.
• The company received flak for its environmental practices.