IDIOMS
World of sports
IN ENGLISH, THE BUSINESS WORLD DRAWS SIGNIFICANT INSPIRATION FROM THE WORLD OF SPORTS, WHICH IS REFLECTED IN MANY COMMONLY USED EXPRESSIONS. WE HAVE COMPILED A LIST OF OVER 130 SUCH EXPRESSIONS, COMPLETE WITH EXPLANATIONS AND EXAMPLES.
BLIND-SIDED.

The expression "blind-sided" means being caught off guard by an unexpected event, often in a negative context.
In business, it is used to describe a situation that triggers a strong emotional reaction, such as surprise or disappointment, or that has tangible consequences, such as the loss of a client, an employee, or significant financial resources.
The origin of this expression comes from American football, where a player can be tackled or blocked without seeing the attack coming. The most well-known scenario involves the quarterback, who can be hit by a defender approaching from their "blind side," meaning the side opposite their throwing arm. The film The Blind Side, starring Sandra Bullock, helped popularize this expression.
Examples:
We were blindsided by the merger of our two biggest competitors.
Our oldest and biggest client blindsided us by going with another provider.
I was blindsided that this promotion was given to Denyse; I thought I was more deserving.