The word "台下" is formed through a straightforward morphological process in Chinese, combining the noun "台" (tái), meaning "stage" or "platform," with the locative noun "下" (xià), meaning "below" or "under." This creates a compound word with a literal spatial meaning of "the area below the stage." Through common semantic extension, this physical location is then metaphorically used to refer to "the audience" or "the spectators," who are situated in front of and below the raised platform, thus encapsulating both a direct positional description and its associated figurative meaning in a single, efficient lexical unit.