the beginning, to start, to begin, to be the first
乨 centers on the concept of beginning or starting: being the first, initiating something, or marking the start of an event.
乨 is a rare character whose exact historical development is uncertain. It visually combines 台 and 乚, but the component relationship is not clearly established.
The left side 台 can suggest a platform or starting point, and the right side 乚 looks like a hook pulling something into motion. Picture a platform with a hook that starts a machine: 乨 is the beginning.
For シ, imagine a starting line where a runner says 'She' (シ) is the first to begin: 'She' -> シ, and she starts the race.