Rejoice
Delighted, Pleased
If there is a drum in your mouth it's time to rejoice! And because of your mouth drum your rejoicing will be loud and booming!
き
よろこ
None
You loudly rejoice for a while when suddenly someone runs over and shoves a key (き) in your mouth, locking it shut. You can't rejoice anymore! You need that key to unlock your mouth!
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