The definition of tried and true refers to something that has been tested, or that has been used in the past and worked well and which is trusted.
An example of a tried and true method of getting stains out of white clothes is to use bleach.
proven by experience over time to be useful, effective, reliable, etc.
Tested and proved to be worthy or good.
- (idiomatic) Well-established and tested; known to work or succeed based on extensive experience.
- He liked to stick to tried and true methods in his garden.