overflow - definition and synonyms

noun [countable] 

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  1. 1
    an extra amount of people or things that do not fit into a particular space

    Will this room be big enough to accommodate the overflow?

    1. a.
      something that provides extra space when another space becomes full

      an overflow car park

  2. 2
    a hole or pipe that allows a substance to flow out of a container when it gets too full