WordNet
weak point
n. an attribute that is inadequate or deficient [ant: forte]
Usage examples of "weak point".
Mal took his hands off him and got a file flash: Sammy railing against queers to Doc Lesnick, a weak point they could have played smart.
But ice crystals formed in her blood at the thought of performing monomi no jitsu: finding and attacking the weak point in the enemy's defenses.
Paks looked for Dorrin - she had found what she thought was a weak point in the attacker's ring, and was shifting the cohort to strike there.