C2 noun /ˈtʌtʃ.stoʊn/
Touchstone
étalon; critère
Meaning
a standard or criterion by which something is judged or recognized; a test of genuineness
Example
His honesty became the touchstone by which all other employees were measured.
Son honnêteté est devenue l'étalon par lequel tous les autres employés étaient mesurés.