Achilles' Heel
An Achilles’ heel is a deadly weakness in spite of overall strength, that can actually or potentially lead to downfall. While the mythological origin refers to a physical vulnerability, idiomatic references to other attributes or qualities that can lead to downfall are common.
Famous quotes containing the word heel:
“In the dense light of wakened flesh
animal man is a prince. As from alabaster
a lucency animates him from heel to forehead.
Then his shadows are deep and not gray.”
—Denise Levertov (b. 1923)