zhì​mìng​shāng

fatal weakness

致命伤 (致命傷) zhì​mìng​shāng
fatal weakness noun
a crucial flaw or vulnerability; an Achilles' heel

The lack of core technology is this company's Achilles' heel.

mortal wound noun
a physical injury that causes death

The stab went straight to the heart and was the fatal wound that caused his death.

Frequency

Movie subtitles
1.19 per million appears in 1% of films
Written text
0.722 per million

Sources

Definitions
CC-CEDICT