Not a common word in conversation.
mga banyagang manunupil
to bully, to dominate, to subdue
sinupil at inapi ng mga mananakop
subdued and abused by conquerors
Ang hindi makasupil sa iyo ay siyang nakakapagpalakas sa iyo.
The thing that is unable to subdue you is what will strengthen you.
= "What doesn't kill you makes you stronger."