What does bathwater mean?
Bathwater is the water left in a bathtub after someone has bathed, typically cloudy, soapy, and cooled from its original warmth. It is a compound noun formed from 'bath' and 'water', and it is almost always treated as an uncountable mass noun rather than counted in individual quantities. In everyday language the word appears in two ways: literally, when describing draining, reusing, or disposing of bath water — for instance, in discussions of water conservation where household 'greywater' may include it — and figuratively, through one of English's most enduring idioms, 'to throw the baby out with the bathwater', which warns against discarding something valuable while getting rid of something worthless. That idiom gives bathwater a lasting cultural resonance far beyond its humble literal meaning, making it a word that is both ordinary and metaphorically rich.
nounThe water in which someone has bathed; also used figuratively to describe something worthless or disposable, as in the idiom 'to throw the baby out with the bathwater' (discarding something valuable along with what is worthless).
- The water in which a person has bathed (literal sense).
- Something regarded as worthless, dirty, or fit only to be discarded (figurative sense).
"She pulled the plug and watched the soapy bathwater swirl down the drain."
"After the children were out of the tub, he emptied the grey bathwater onto the garden."
"In restructuring the department, be careful not to throw the baby out with the bathwater."
Bathwater is normally uncountable; a plural form is occasionally seen in technical contexts referring to batches of bath water, but this is uncommon and generally avoided.
"The spa recycled several tanks of bathwaters collected throughout the day."
The phrase 'don't throw the baby out with the bathwater' dates back to at least the 1500s, when German writer Thomas Murnus joked about a household so eager to empty its tub that it tossed out the child along with the dirty water.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bathwater
Bathwater is an English compound of 'bath' and 'water'. 'Bath' derives from Old English 'bæþ', from Proto-Germanic roots related to warming and immersion, cognate with German 'Bad'; 'water' likewise descends from Old English 'wæter', from Proto-Germanic '*watōr'. The compound has existed in English for centuries and gained particular prominence through the proverbial expression about throwing the baby out with the bathwater, which circulated in German before becoming established in English by the early modern period.
How bathwater is actually used
Almost always uncountable and used in singular mass-noun form. The figurative use is overwhelmingly confined to the idiom about discarding the baby with the bathwater; outside that idiom, 'bathwater' is nearly always literal.
Easily confused with bathwater
A bathrobe is a garment worn after bathing, whereas bathwater is the water left over from a bath.