The idiom "acid test" means a rigorous or difficult test that determines the true value or quality of something or someone. The term originated from the practice of testing gold with nitric acid to determine its purity. If the gold could withstand the acid without corroding, it was considered pure.
In everyday usage, the term "acid test" is used to describe a situation where something or someone is put to the ultimate test to determine their true worth or ability. For example, if a new employee is hired for a challenging job, their performance during the first few months may be considered the acid test to determine if they are capable of handling the job.
Similarly, a product may be subjected to an acid test to determine its durability or effectiveness. For instance, a car manufacturer may test the durability of a new car model by driving it on rough terrain to see how it performs under extreme conditions.
In summary, the idiom "acid test" is used to describe a challenging or rigorous test that determines the true value or quality of something or someone.
• The job interview was an acid test for my confidence and communication skills.
• The teacher gave us an acid test to see if we had understood the lesson.
• The team's performance in the championship game will be the acid test of their abilities.
• The new product launch will be an acid test for the marketing department's strategy.
• The successful completion of the project under tight deadlines was the acid test of their professional skills.
• I did an acid test on my new car's brakes by driving slowly and pressing them gently.