knock-on effect

/N AA1 K AA0 N IH0 F EH0 K T/
noun
  1. 1

    A secondary, often unintended effect; a repercussion, chain reaction.

    โ€œIf a coach arrives late, it has a knock-on effect on the entire coach station.โ€

Source: https://en.wiktionary.org/wiki/knock-on%20effect