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be (as) pure as the driven snow

To be virtuous and/or chaste. The bride looked as pure as the driven snow in her gown. Kate would never cheat on an exam—she's pure as the driven snow.
See also: driven, pure, snow

*pure as the driven snow

pure and chaste. (Often used ironically. *Also: as ~.) Jill: Sue must have gone to bed with every man in town. Jane: And I always thought she was as pure as the driven snow. Robert was notoriously promiscuous, but tried to convince all his girlfriends that he was pure as the driven snow.
See also: driven, pure, snow

*white as a sheet

 and *white as a ghost; *white as snow; *white as the driven snow
[of someone] extremely pale, as if frightened. (*Also: as ~.) Marilyn turned as white as a sheet when the policeman told her that her son had been in a car wreck. Did something scare you? You're white as a sheet! Jane made up the bed with her best linen sheets, which are always as white as snow. We have a new kitten whose fur is white as the driven snow.
See also: sheet, white

be as pure as the driven snow

to be morally good How dare he criticize me for having an affair? He's not exactly as pure as the driven snow himself.
See also: driven, pure, snow

pure as the driven snow

Morally unsullied, chaste, as in She's just sixteen and pure as the driven snow. This simile dates from the late 1500s, although driven, which means "carried by the wind into drifts," was occasionally omitted. It is heard less often today.
See also: driven, pure, snow

white as a sheet

Very pale in the face, as in She was white as a sheet after that near encounter. This simile, dating from about 1600, survives despite the fact that bedsheets now come in all colors.
See also: sheet, white
References in classic literature ?
Meanwhile the Argives were neither driven towards their ships by Mars and Hector, nor yet did they attack them; when they knew that Mars was with the Trojans they retreated, but kept their faces still turned towards the foe.
This coachman, Peter by name, is seventy years old, and was born on the place, and has driven its occupants for fifty years, and I am nearly as fond of him as I am of the sun-dial; indeed, I don't know what I should do without him, so entirely does he appear to understand and approve of my tastes and wishes.
Hartford Depot, but before we'd driven a hundred yards she pulled the check-string and ordered me to go to the Waldorf.
The DVR has driven up the demand for high capacities so that today drives are available with up to 400GB--which can record up to 400 hours of standard TV and more than 40 hours of high-definition video.
JVC's decision to use hard drives as a means of storage on its new Everio camcorders was driven by consumer demand for greater portability and storage capacity and more flexibility in data manipulation.
These markets were initially being driven by White Box VARs and System Builders looking for ways to compete with the branded storage solutions.
According to Quantum chairman and CEO Michael Brown, difficult conditions in the desktop disk drive business today are being driven by two distinct phenomena occurring simultaneously.
All current helical scan products utilize a dual hub driven cassette/cartridge and a rotating multi-channel recording head.