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1.
A weak point or quality of a person
The kid wasn't good at jump shots.
"Jump Shot are his Achilles Heel"
by the mess May 15, 2004
 
2.
noun; a weakness in someone or something that is strong overall (the weakness is often, but not always, seemingly small but crucial, leading to misfortunate events)
The Brazilian soccer team's defense was its Achilles' heel in World Cup 1998. Despite having strong forwards, the team was ultimately scored upon three times by France.
by Nathan June 17, 2006
 
3.
A point of vulnerability.
The warrior Achilles was totally protected by his armor, except for a small spot by the back of his foot where an arrow went through.

A weakness for chocolate cake was the dieter's Achilles heel.
by Chloethecat June 28, 2012