JMdict: 1634310

尻もち 【しりもち】

  1. [n] falling on one's backside; pratfall
  2. [n] mochi used to celebrate a child's first birthday; mochi tied to a baby's back if he starts walking before his first birthday in order to cause him to fall on his backside
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
尻 Buttocks, Hips, Butt, Rear コウ しり