彭
ホウ
swelling, sound of drum
JLPT0 G13 S0 F2409
As per
壴
# as described in 鼓 (drum set on a stand) +
彡
pattern → *beat* a drum in a rhythmic pattern (compare 鼖). *Swell* is a borrowed meaning via
膨
.
[Full Kanji Etymology List]