tried and tested

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tried and tested

Proven to be reliable through frequent, widespread, or long-time use. The tried and tested method for getting someone to confess is to just let them keep talking. The tried and tested first food for babies is rice cereal, but you can really feed them anything mushy.
See also: and, test, tried

ˌtried and ˈtested/ˈtrusted

(British English) (American English ˌtried and ˈtrue) that you have used or relied on in the past successfully: We’ll be using a tried and tested technique to solve the problem.
See also: and, test, tried, trust
References in classic literature ?
And now the ghostly apparition of her had returned as to a tried and trusted friend; had commanded me to remember her and to go to her; and had provided against all possibility of my memory playing me false, by writing the words which invited me to meet her "when the full moon shone on Saint Anthony's Well.
The tried and trusted old friend of this family will be always a welcome visitor in any house of mine.