If there is a knock-on effect, one action or event causes several other events to happen one after the other. The cut in new car prices has had a knock-on effect on the price of used cars. have a knock-on effect (on sth) to start a process in which everything that happens causes something else to happen
knock on
التركية النطق
näk ôn
النطق
/ˈnäk ˈôn/ /ˈnɑːk ˈɔːn/
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[ 'näk ] (verb.) before 12th century. Middle English knoken, from Old English cnocian; akin to Middle High German knochen to press.