la (noun) — sense 1

And now Mrs Waters (for we must confess she was in the same bed), being, I suppose, awakened from her sleep, and seeing two men fighting in her bedchamber, began to scream in the most violent manner, crying out murder! robbery! and more frequently rape! which last, some, perhaps, may wonder she should mention, who do not consider that these words of exclamation are used by ladies in a fright, as fa, la, la, ra, da, &c., are in music, only as the vehicles of sound, and without any fixed ideas.