Drum, Beat
You take a drum and a branch and... well, what else would you do? You would drum or beat them together.
A branch is just like a drumstick, so of course you're going to drum them together.
こ
つづみ
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Who loves to drum things together and make a huge racket? 子s (こ), of course.
Kids can't get enough of it. Anything that makes a loud drumming noise or anything they can beat together is fun for them.