Anglais ⇄ Russe +

be a nut on contraintes
génér.	помешаться (на чем-л., smth. • "He's a nut on movies," Gail McKinnon went on. "He remembers every picture that's ever been made." (I. Shaw))
be a nut on something
génér.	помешаться на (чем-либо)