I have encountered the UK phrase "knock-on effect" several times today in New Scientist magazine. Because I do not understand what it means, I looked it up in Quinion and Word-Detective but could not find it. Here is a sample:

"The University carries out a cost benefit analysis and decides on the
appropriate level(s) of service for the MLE. This must take into account the
"knock-on" effect on the support and underlying infrastructure services on
which the MLE relies."