The phrase 'to study under' captures the essence of 師事する quite elegantly in English. It implies a formal or dedicated learning relationship where one person guides another's development.
Historically, Leonardo da Vinci studied under Andrea del Verrocchio, absorbing techniques that would later define Renaissance art. In modern contexts, this dynamic exists in academic circles—doctoral students often 'study under' their advisors. The relationship extends beyond mere instruction; it's about mentorship, shared values, and sometimes even artistic or intellectual lineage.
What fascinates me is how these bonds transcend cultures. Japanese ukiyo-e masters like Hokusai had apprentices, while in Hollywood, directors like Quentin Tarantino openly acknowledge mentors who shaped their cinematic language.
英語圏では'Silly little brother'とか'My dumb kid brother'といった表現が近いかもしれません。特に'kid brother'という表現は年少の兄弟に対するカジュアルな呼び方で、日本語の'愚弟'に通じる親しみが感じられます。ドラマ'The Big Bang Theory'のシェルドンとミスの兄弟関係を思い出すと、まさにこのニュアンスが伝わってきます。