noun
secretly slitting one's belly; concealed seppuku (in kabuki/bunraku)
A theatrical technique in traditional Japanese drama where a character appears to die by seppuku but hides the fatal wound until a dramatic reveal. Not used in everyday language.
歌舞伎の『仮名手本忠臣蔵』では、判官が陰腹を切る場面が有名だ。
In the kabuki play 'Kanadehon Chūshingura', the scene where the magistrate performs kagebara is famous.