gold standard

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a monetary standard under which the basic unit of currency is defined by a stated quantity of gold
• Hypernyms:
standard, monetary standard
2. a paragon of excellence
- academic education is the gold standard against which other educational activity is pejoratively judged
• Hypernyms:
paragon, idol, perfection, beau ideal