1. in. to be believed. (As if untruth were a stain that will not come out in the wash.) That’ll never wash! It’s totally unbelievable.
2. n. a drink that follows a previous drink; a chaser. Can I have a wash with this, bartender?
3. n. the almost simultaneous sale and purchase of the same stock, usually to make the stock appear to be trading actively. (Securities markets. The practice is illegal. Tax loss selling must be done in such a way to avoid appearing to be a wash.) I sold the stock and couldn’t buy it back for thirty days to avoid an illegal wash.
4. n. a whitewash or covering up (of a problem). What the administration presented was not an explanation but a wash.