If a liquid or a river overflows, it flows over the edges of the container or place it is in.

If a place or container is overflowing with people or things, it is too full of them.

If someone is overflowing with a feeling or if the feeling overflows, the person is experiencing it very strongly and shows this in their behaviour.

The overflow is the extra people or things that something cannot contain or deal with because it is not large enough.

An overflow is a hole or pipe through which liquid can flow out of a container when it gets too full.

If a place or container is filled to overflowing, it is so full of people or things that no more can fit in.