on the qui vive

The political influence wielded by many of the court ladies, and especially by the first lady-in-waiting (mother of the present Emperor), bears a certain resemblance to that which the eunuchs wielded under the later Manchus at the court of Peking. […] And behind the 30 ladies-in-waiting there are the rank and file of female palace attendants, some 300, all of Kyoto stock—quite sufficient to keep any conscientious chamberlain on the qui vive.