nǐ sǐ wǒ huó
lit. you die, I live (idiom); irreconcilable adversaries
two parties cannot coexist
你
nǐ
you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)
死
sǐ
to die
我
wǒ
I; me; my
活
huó
to live