This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
劧 combines 手 (hand) and 力 (strength/power), but its exact historical development and original meaning are uncertain.
A hand 手 beside strength 力 could suggest a firm grip or something made strong by hand, but the actual meaning is unclear.
For シ, imagine a strong hand gripping a sheet of paper: sheet -> シ, and the hand's strength holds it tight.