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trial and error
01
the process of testing a method, an idea, etc. in several ways to achieve the desired outcome
Example
The chef perfected the recipe by using trial and error, trying various ingredients until the dish tasted right.
It took hours of trial and error to put it together correctly.
Starting a new business often involves trial and error as entrepreneurs figure out what strategies succeed and what does not.
Building the prototype required trial and error to see which materials and designs performed best.
After hours of trial and error, she finally succeeded in developing a roll of film with crisp, well-exposed images.
