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flush 1 (flŭsh)
v. flushed, flush·ing, flush·es
To turn red, as from fever, heat, or strong emotion; blush.
To clean, rinse, or empty with a rapid flow of a liquid, especially water.
An act of cleansing or rinsing with a flow of water.
A reddening of the skin, as with fever, emotion, or exertion.
A brief sensation of heat over all or part of the body.
Having plenty of money; affluent, esp temporarily; rich: It took money, and the jazzman wasn't ever too flush (1603+)verb
four-flush, in a flush
To delete something, usually superfluous, or to abort an operation.
"Flush" was standard ITS terminology for aborting an output operation. One spoke of the text that would have been printed, but was not, as having been flushed. It is speculated that this term arose from a vivid image of flushing unwanted characters by hosing down the internal output buffer, washing the characters away before they could be printed.
2. To force temporarily buffered data to be written to more permanent memory. E.g. flushing buffered disk writes to disk, as with C's standard I/O library "fflush(3)" call. This sense was in use among BLISS programmers at DEC and on Honeywell and IBM machines as far back as 1965. Another example of this usage is flushing a cache on a context switch where modified data stored in the cace which belongs to one processes must be written out to main memory so that the cache can be used by another process.