Question

what is the meaning of achilles heel?
natalie enjoys all her classes and does well in every one except french, which is her achilles heel.
a weakness
a part of the foot
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Explanation:

The phrase "Achilles' heel" is an idiom. In Greek mythology, Achilles was invulnerable except for his heel. Now, it's used metaphorically. In the context, Natalie does well in all classes except French. So, it's used to mean a weakness.

Answer:

a weakness