Bathwater (noun)

The water in which a person has bathed, typically considered as dirty or no longer clean.

Origin:

Late 16th century: from the verb bathe + water.

Examples:

1. The baby's bathwater was too hot and had to be cooled down.
2. The bathwater was drained after the bath was over.
3. She added some bubble bath to the bathwater for a relaxing soak.
4. The bathwater turned cold after a long soak.
5. The bathwater was filled with rose petals for a luxurious bath experience.