adverb
Describes something fitting or inserting perfectly into a space, often with a sense of completeness or no gap.
このキャップはすぽっと閉まる。
This cap closes snugly.
箱にすぽっと収まった。
It fit perfectly into the box.
adverb
with a pop; with a plop; straight down
Mimetic for a sudden, clean removal or falling motion, often with a popping sound. Used for corks, plugs, or objects dropping straight.
コルクがすぽっと抜けた。
The cork came out with a pop.
ボールがすぽっと穴に落ちた。
The ball fell straight into the hole with a plop.