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The phrase "Achilles heel" is correct and commonly used in written English.
It is used to describe a particular weakness or vulnerability that someone or something may have. For example, "John's Achilles heel is his temper - if you upset him he will lash out in anger".
Dictionary
achilles heel
noun
A vulnerability in an otherwise strong situation.
Exact(59)
My Achilles' heel?
'That's his Achilles heel.
That's our Achilles' heel.
Achilles heel, anyone.
That's been our Achilles heel.
That's been his Achilles' heel.
Racism remains an Achilles' heel.
It seems their Achilles' heel.
This is my achilles heel.
Has she no Achilles Heel?
Similar(1)
'Achilles' heel' of sickle cell disease?
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com