鞭闢入裡

penetrated / trenchant / incisive

whip or lash / to flog / to whip / conductor's baton / segmented iron weapon (old) / penis (of animal, served as food)

to open (a door) / to open up (for development) / to dispel / to refute / to repudiate

to enter / to go into / to join / to become a member of / to confirm or agree with / abbr. for 入聲|入声[ru4 sheng1]

lining / interior / inside / internal / also written 裏|里[li3]