in the day when the keepers of the house (hands, arms) tremble, and the strong men (feet, knees) bow themselves, and the grinders (molar teeth) cease because they are few, and those (eyes) who look through the windows grow dim;

when the doors in the streets shall be shut, and when the voice of the miller shall be laid down; when men shall rise up at the voice of the bird, and when all the daughters of music shall be brought low;