C2 noun /ˈtʌtʃ.stoʊn/
Touchstone
piedra de toque; estándar
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.
Su honestidad se convirtió en la piedra de toque por la cual se midió a todos los demás empleados.