| Cut corners take shortcuts / compromise quality | to do something the easy way, sacrificing quality or thoroughness | The contractor cut corners to finish ahead of schedule, and the building was unsafe. |
| Move the goalposts shift the criteria / change the terms | to change the rules or criteria during a process, making it harder to succeed | Every time we met their demands, they moved the goalposts. |
| Paradigm shift revolutionary change / fundamental shift | a fundamental change in approach or underlying assumptions in a field | The internet caused a complete paradigm shift in how information is distributed. |
| Double-edged sword two-sided issue / mixed blessing | something that has both advantages and disadvantages | Social media is a double-edged sword: it connects but also isolates. |
| Vicious circle downward spiral / self-reinforcing problem | a sequence of problems where each one makes the others worse | Poverty leads to poor education, which leads to more poverty — a vicious circle. |
| Watershed moment turning point / pivotal moment | a turning point that marks a fundamental change | The moon landing was a watershed moment in human history. |
| Straw man argument false representation / distortion of argument | misrepresenting someone’s position to make it easier to attack | Claiming your opponent wants to abolish all law is a straw man argument. |
| Red herring distraction / misleading clue | something introduced to divert attention from the real issue | The politician’s personal life is a red herring in the policy debate. |
| Foregone conclusion inevitable outcome / predetermined result | a result that is certain or was decided before it began | Given the evidence, the verdict was a foregone conclusion. |
| Carte blanche free rein / unlimited authority | complete freedom to act however one wishes | The board gave the new CEO carte blanche to restructure the company. |
| Sine qua non essential requirement / prerequisite | something absolutely essential; an indispensable condition | Trust is the sine qua non of any effective working relationship. |
| Zeitgeist spirit of the age / cultural moment | the defining spirit or mood of a particular period of history | The film perfectly captured the zeitgeist of the 1960s counterculture. |