pillar-box red 
noun [mass noun] British
A bright red colour, like that in which pillar boxes are painted.They were an emergency service. That's why they were painted pillar-box red....
- The show-off specimens today, though, are the Japanese maples in Acer Glade and Silk Wood: pillar-box red, fuchsia pink, Jaffa orange.
- I did dye my hair red, pillar-box red, twice, once when I was about 15, once about a month ago.
- where
- whereabouts
- whereafter
- whereas
- whereat
- whereby
- where'er
- wherefore
- wherefrom
- wherein
- where it's at
- whereof
- whereon
- where one lives
- where (or when) the rubber meets (or hits) the road
- wheresoe'er
- wheresoever
- where someone is at
- where someone is coming from
- where's the fire?
- where there's a will there's a way
- where there's muck there's brass
- whereto
- whereupon
- wherever