The word 叫板 is formed from the character 叫, meaning "to call" or "to shout", and 板, which here specifically refers to the clapper board used by the drummer in traditional Chinese opera to set the rhythm. In opera performance, when an actor delivers a line or aria with a strong vocal cue directed at the drummer, it is literally "calling the board" to signal the start or change of a musical passage. This concrete action from the theatrical context established the compound word, which later acquired the extended meaning of challenging or confronting someone.