English Reference
noun · adjective · verb

blue

n. · adj. · v.
US /ˈbɫu/ UK /blˈuː/ blue UK spelling blueing

  1. 01 A1 Beginner

    n.the colour of the clear sky or the sea.

    n.the colour between green and violet in the visible spectrum; one of the primary additive colours.

    Simple

    The artist used a bright blue for the sky in her painting.

    In context

    The deep blue of the Mediterranean was captured perfectly in the photographer's latest series of coastal landscapes.

  2. 02 A1 Beginner

    adj.having the colour of the sky or sea.

    adj.possessing a blue hue or tint.

    Simple

    He wore a blue shirt that matched his eyes.

    In context

    The architect specified blue tinted glass for the skyscraper to reflect the surrounding atmosphere.

  3. 03 B1 Intermediate Informal

    adj.feeling sad, unhappy, or without hope.

    adj.experiencing low spirits, melancholy, or mild depression.

    Simple

    I was feeling a bit blue after my best friend moved away.

    In context

    Despite the festive atmosphere, he couldn't help feeling blue on the anniversary of his father's passing.

  4. 04 B2 Upper Intermediate Politics

    adj.related to a specific political party, like the Democrats in the US or Conservatives in the UK.

    adj.pertaining to a political party represented by the colour blue; usage varies by country.

    Simple

    California is known as a blue state in American presidential elections.

    In context

    The candidate focused her campaign efforts on traditionally blue districts where voter turnout was expected to be high.

    red
  5. 05 C1 Advanced Informal

    adj.containing jokes or stories about sex that some people might find offensive.

    adj.referring to content that is risqué, indecent, or contains profane language.

    Simple

    The comedian was famous for his blue jokes that were only for adults.

    In context

    The film was edited for television to remove the bluer segments of the dialogue that were deemed inappropriate for a general audience.

    risquéobscenevulgar
  6. 06 B2 Upper Intermediate Literary

    n.a poetic way to talk about the sky or the ocean.

    n.a metonymic reference to the clear sky or the deep ocean.

    Simple

    The eagle soared high up into the wide blue.

    In context

    The sailors stared out into the endless blue, searching for any sign of land after weeks at sea.

  7. 07 C2 Proficiency DialectInformal

    n.a fight, a loud argument, or a mistake.

    n.a physical brawl, a heated verbal argument, or a significant blunder.

    Simple

    The two players got into a blue on the field during the game.

    In context

    A massive blue erupted outside the pub after the local team lost the grand final.

    Usage

    Primarily used in Australian and New Zealand English.

    Teacher's tip

    Learners should be aware this is highly regional; in most other dialects, 'blue' never means a fight.

  8. 08 C1 Advanced Technical

    v.to make something blue or to become blue.

    v.to cause to become blue; to treat a surface so it takes on a blue tint.

    Simple

    The cold weather blued his lips as he waited for the bus.

    In context

    The craftsman carefully blued the steel barrels of the antique firearm to protect them from corrosion.

Usage blue whales · blue stars


From the German surname, Americanized from Blau or its French cognate Bleu.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin French -
Level A1 · Beginner
Frequency Very common
Updated