Notice the slurs in the violins that sound like cats "meowing", indicating the "cat fight" that breaks out between them.
Marcellina (curtsying): To greet you, my lady, I'm honored supremely.
Susanna (curtsying): By your recognition I'm flattered extremely.
Marcellina (curtsying): Please enter before me.
Susanna (curtsying): No, no, you go first!
Marcellina: I beg you, ignore me!
Susanna (mocking): Your noble position, fine and patrician, inspires respect.
Marcellina (mocking): I know my position, bow to tradition, fine and patrician, with all due respect.
Marcellina: The bride of the hour!
Susanna: A lady of station!
Marcellina: The Count's little bella!
Susanna: The pride of the nation!
Marcellina: Her attitude!
Marcellina: Her posture!
Susanna: Your age!
Marcellina: I swear I shall fly at her in one minute more!
Susanna (aside) Decrepit old battle ax, I'll settle your score.
Marcellina: I praise your deportment without reservation.
Susanna: And I, your experience and broad reputation!
Marcellina: So young and so pretty!
Susanna: The belle of the city!
Marcellina: What distance between us!
Susanna: The true Spanish Venus!
Marcellina: So innocent!
Marcellina: So simple!
Susanna: So old!
Marcellina: How dare she make fun of me, it is a disgrace!