Rosetta Stone

Definitions

1. A large inscribed stone found near Rosetta, Egypt, in 1799, later used as a basis for understanding many previously undecipherable examples of hieroglyphic writing.
2. Any source of information crucial to interpreting.
   broadly

Equivalents

Examples

“My friend’s carefully-compiled notebook was the Rosetta Stone that opened up understanding of the physics lectures.”

CEFR level