Jisho

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Adverb (fukushi)
1. snugly (into hole, container, etc.); tightly (fitting, covering); firmlyOnomatopoeic or mimetic word
Adverb (fukushi)
2. (with a) pop (i.e. sound of a cork, etc. being pulled out of a hole in one movement); with a plop; (fall) straightOnomatopoeic or mimetic word
Other forms
スポッと

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