bluer means A blue blazer, part of the school uniform at Harrow School. Lexicurio rates it Rare gem — a strength score of 83 out of 100.
noun
- 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.'”