Synonyms for "knock on effects" include "ripple effects", "domino effects", "chain reactions", "spillover effects", and "collateral impacts". These terms all refer to the idea that one event or action can have far-reaching consequences that are felt beyond the immediate situation. These effects can be positive or negative, and they can be intentional or unintended. The term "knock on effects" is commonly used in business and economics to refer to the cascade of effects that can occur when a major event, such as a recession or market downturn, impacts various sectors of the economy. Overall, these synonyms illustrate the complex and interconnected nature of our world.