I want them to run along this street and knock off every bowler they see.

Taken from the "The Time Machine (2002)". What does "knock off" mean here?
"Make fall to the ground", I guess.

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A 'bowler' is a type of hat with a round top, often worn by traditionally-dressed London business-men.

Without a context, but given that this is written by H. G. Wells, I'd say it means I want them to run along this street and hit all the men's hats, knocking the hats onto the ground.

Best wishes, Clive
"often worn by traditionally-dressed London business-men" - not any more, Clive Emotion: big smile
Geez, as soon as I leave the country, the standards all go down!Emotion: sad
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thank you all.