1. Plural of dishwater; water that has been used for washing dishes, typically containing soap, grease, and food particles.
Usage: Usually uncountable in singular form, but 'dishwaters' is used when referring to multiple instances or batches of such water.
2. Something regarded as weak, unpleasant, or of poor quality (figurative use).
Usage: informal; often used in the phrase 'dull as dishwater'

Examples

• She poured the dishwaters down the drain after washing the dinner plates.
• The old dishwaters from the restaurant kitchen were collected for disposal.
• The movie was dull as dishwater and put everyone to sleep.
• He complained that the coffee tasted like dishwaters.
• Multiple batches of dishwaters accumulated in the sink throughout the day.