ZUPPO-RI ずっぽり
Meanings
・The state of something sinking heavily into a liquid or something soft.
Examples
・My boots were stuck in the rice paddies.
田んぼの中に長靴がずっぽりとはまって抜けない。
Dogmatic Opinion
The image of being covered by something viscous such as mud or swamp rather than something less viscous such as water, hot water, or rain.
Therefore, they are gradually covered over time.
The state of penetration in sex would also fall under this category.
Proximate Expression
stuck