quick method; shortcut; royal road
Refers to a method that achieves a goal faster than usual, often in learning or skill acquisition. 'Royal road' is a figurative translation for an easy, direct path.
It is said that there is no shortcut to learning a language.
He mastered the piano through a quick method.
Compound of 速成 (sokusei, 'quick completion') + 法 (hō, 'method'). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.