That's the last drop that overfills the cup.
"King Cole"
John Masefield
Now, strange as it may seem, the very moment Mona sets her foot upon the polished ballroom floor, and sees the lights, and hears the music, and the distant splashing of water in some unknown spot, and breathes the breath of dying flowers, all fears, all doubts, vanish; and only a passionate desire to dance, and be in unison with the sweet sounds that move the air, overfills her.
"Mrs. Geoffrey"
Duchess