WASHER

noun

1. Something that washes; especially an appliance such as a washing machine or dishwasher.
2. A person who washes (especially clothes) for a living; a washerman or washerwoman.
3. A flat disk, placed beneath a nut or at some joint, to distribute pressure, alleviate friction or prevent leakage.

verb

1. To fit (a mechanical device) with a washer.