OVERFLOW (3)

O″ver‐flow′ (?), n. 1. 1. A flowing over, as of water or other fluid; an inundation. Bacon.
2. 2. That which flows over; a superfluous portion; a superabundance. Shak.
3. 3. An outlet for the escape of surplus liquid.
Overflow meeting, a meeting constituted of the surplus or overflow of another audience.