依

Left-side person radical, side-form of 人 — the indexing radical. Anchors 依 in human dependence: to rely on, lean on, take support from. These are fundamentally social acts — a person leaning on another person, an institution, or a tradition. Same family of person-relations: 信 trust, 仰 look up to, 仿 imitate.

Right side 衣 supplies the sound — exact tonal match (yī) — and a beautiful semantic echo. 衣 means clothing, what wraps around and supports the body. To rely on someone is to wrap yourself in their support like a garment. The mnemonic is unforced: a person + clothing = the one you depend on.