イン, オン, かく.す, かく.し, かく.れる, かか.す, よ.る, お, がくし

conceal, hide, cover

JLPT1 G7 S14 F1089

The element above in was originally claw/hand + an element combining a symbol in the shape of + another hand → use one hand on top and the other on the bottom to cover and conceal a -shaped object. The addition of heart/emotions suggests secrets concealed firmly in the heart. To # (conceal), 隱 adds 阜 piled earth → earthen wall behind which objects are concealed → *hide/conceal*.

[Full Kanji Etymology List]