trunk, torso, hull (ship), hub of wheel
胴 centers on the main body of something: the trunk of a human or animal, the hull of a ship, or the central hub of a wheel. All meanings point to the core structural part that holds the rest together.
胴 combines ⺼ (flesh/body part) with 同, which likely contributes the sound and the idea of a cylindrical or unified shape. The character originally referred to the large intestine or the trunk of the body.
The left side ⺼ is flesh, and the right side 同 looks like a container or a tube. Picture the flesh tube that is your torso, the main body part that holds everything together.
For ドウ, imagine a dō (道) path running through the center of the torso like a highway: dō -> ドウ, and the trunk is the main route of the body.
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trunk; torso; body; abdomen; waist
trunk; torso; body
tossing (someone) into the air (in celebration)
banker (gambling); bookmaker; person who runs a gambling den; person who rents out space for gambling and charges commission
cylindrical
life jacket; life vest
(sleeveless) undergarment; padded undershirt
waist; girth; measurement around waist
chestnut blight; chestnut canker
sound box (of an instrument); sounding box
twin-boom aircraft
double-hull boat; catamaran
dado (part of a pedestal between the base and the cornice)
slot machine
impression cylinder
stockpot
tub-sided samurai cuirass
barrel drum; drum with an uncurved body
having a long body; long-bodied
long-bodied