I bought a makunouchi bento at the station and got on the Shinkansen.
makuuchi; top division of professional sumo
Sumo term. The highest division of professional sumo wrestlers. Also written 幕内.
See also: 幕内
彼は幕の内力士として活躍している。
He is active as a makuuchi wrestler.
intermission; interlude between acts
Refers to the break between acts in a theatrical performance, especially traditional Japanese theater like kabuki.
幕の内に観客は席を立った。
The audience left their seats during the intermission.