one of the three sacred treasures comprising the Imperial Regalia of Japan

Alternative form of 大頭

(idiomatic) bright, intelligent, sharp

spherical object / ball

a sharp edge (of a ball)

beaten-egg soup

(idiomatic) to be sharp; to be keen; to be on the ball; to have a mind like a steel trap; to be clever

(idiomatic) to get mad; to be highly offended; to get pissed off; to get angry; to lose one's cool

(idiomatic) insane, crazy, nuts, out of one's mind

Alternative form of 頭がおかしい