bluer

Etymology 1

adj

1. comparative form of blue: more blue

Etymology 2

blue + -er (“Oxford -er”). Used at Harrow School in London, United Kingdom.

noun

1. (UK, school slang) A blue blazer, part of the school uniform at Harrow School.
   Bluer buttons illustrate the principle of 'keeping under'. The Knoll rule book states: 'It is a one year priv. [privilege] to have the bottom button on one's bluer undone [and] a three summer priv. to have all the buttons of one's bluer undone.' 1981, James Anthony Mangan, Athleticism in the Victorian and Edwardian Public School, Psychology Press, published 2000, page 170
   He was alone in his room, in his bluer and his tie, seated on a chair, leaning over his bed like a desk—his preferred way to study—holding the stapled pages of the script, muttering the words. 2011, Justin Evans, “Voraciously”, in The White Devil

Etymology 3

blue + -er

noun

1. (rare) Synonym of blue (“blue liquid added to laundry to prevent yellowing”)