How to Use "knock" with Example Sentences

1. Eg. he rushed into the room without troubling to knock .
2. In a panic , she managed to knock out the crocodile and free herself .
3. But his career has taken a knock .
4. It does not take much to knock confidence in the chinese stock market these days .
5. The other knock on combat photographers is that they are cynics who have no loyalties or values .