Parris couldn't believe another man had resorted to using her weakness for her sister's children against her.

You used my uncle's weakness for cards to press your advantage.

And the effort is also framed by the opposition's seeking to use his personal weakness to their advantage.

He hadn't needed her help--but he had used her weakness to his advantage.

Father may be in no fit state to command, and our old foe may have used his weakness to make a move.

She had used his weakness for her to manipulate him.

It was troubling to see the Foreign Minister of a great power desperately trying to use his own weakness as bargaining leverage.

So I have to use my weakness to my advantage.

Heydrich is using the Admiral's weakness to coerce concessions from him.