The meaning for Achilles Heel is literally related to the heel of Achilles, which lead to his death. First let's know a little about Achilles, the Greek hero. In Greek mythology, it's believed that when Achilles was a baby, his mother dipped him in the River Styx holding him by the heel. Since the river had miraculous powers, Achilles' whole body turned powerful and invincible; except for the heel which was held by his mother and so did not get dipped in the waters. His heel turned out to be the most vulnerable / weakest part in his body, despite him being the strongest warrior. During the time of Trojan War (not exactly in the war), Achilles, the strongest warrior was killed by a fatal wound to his heel by Paris's arrow (probably poisoned). So Achilles heel means a weakness or a vulnerable part. Now, if you want to know a little more about the story of the Trojan War & why exactly Achilles was not killed in the war - Here it goes: Achilles killed Hecto...