take a knock
To be diminished, injured, or negatively impacted in some way. Our profits are going to take a knock if we don't start reducing our manufacturing costs. He's taken some knocks out there tonight, and it looks like it's affecting his game.
take a knock
suffer a material or emotional setback.take a (hard, nasty, etc.) ˈknock
have an experience that makes somebody/something less confident or successful; be damaged: His reputation has taken a bit of a knock since the newspapers printed stories about his private life.
