KanjiJLPT N1
Trunk

trunk, torso, hull (ship), hub of wheel

Mnemonic

Under the moonlight, every human silhouette looks the same — just a trunk, a featureless torso. Strip away the arms, legs, and head lost in shadow, and all you see is the same dark cylindrical core standing beneath the moon.
Additional thoughts
Moonlight flattens detail, reducing people to identical torso shapes. Moon = body/flesh radical. Same = all torsos share one universal form. Picture a row of silhouettes: only trunks visible.
Quick recall
Under the moon, every body looks the same — just a trunk.

Details

The keyword for 胴 is trunk. This kanji refers to the main part of the body, specifically the torso or midsection, excluding the head, arms, and legs. It is the central core of the human body that houses the vital organs. The term can also be extended to describe the main body or cylindrical middle section of objects, such as the body of a drum or a barrel.
On'yomi
どう

Used in vocab