隠 (readings: いん, おん, かく, かか, よ; Japanese kanji) means “Conceal / Hide / Cover”. It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 隠居 (retirement).
What does 隠 mean?