whiten up

whiten up

1. To become or appear whiter. His blond hair began whitening up from being in the sunshine all summer long. Try adding a scoop of baking soda to your clothes or linens if you want them to whiten up.
2. To cause something to become or appear whiter. In this usage, a noun or pronoun can be used between "whiten" and "up." The detergent promises to whiten up your clothes. I want to get a toothpaste that whitens up my teeth.
See also: up
Farlex Dictionary of Idioms.

whiten up

v.
1. To become whiter: The towels whitened up when I washed them with bleach.
2. To cause something to become whiter: The dentist whitened up my coffee-stained teeth. This polish will whiten your golf shoes up.
See also: up
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • blond moment
  • blonde
  • fizzle out
  • walk on sunshine
  • scoop out
  • bombshell
  • blond
  • blond bombshell
  • have a blond moment
  • What's the scoop?
References in periodicals archive
"It is proven to whiten up to 10 times better than other brands while being ideal for people with the most sensitive teeth and gums.
Oral Care suppliers keep raising the bar
Redding, CA, November 14, 2012 --(PR.com)-- Whiten Up! Redding's new website is now up and running.
Whiten Up! Redding offers professional teeth whitening services.
At Whiten Up! Redding, patients can get professional teeth whitening services along with quality customer service.
Redding Teeth Bleaching Company Launches Website Offering Whitening Products