◎◎◎ nemesis ⪢⪢
On the one hand, nemesis can be your enemy. So somebody is your sworn enemy, they are your nemesis.
◎◎◎ foe ⪢⪢
enemy, opponent
 enemy ⪢⪢
Pay attention to your enemies for they are the first to discover your mistakes. #quote
○○○ take measures ⪢⪢
Tired of the constant danger that the cat presented, one of the mice decided to summon a general counsel so that all the mice could debate what measures they could take to outwit their common enemy the cat.
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