Fixed expressions
Idioms
English fixed expressions — phrases whose meaning isn't obvious from the individual words. Each entry shows the meaning, an example sentence, and its register.
Idioms containing blue, including its inflections. Clear word filter
2 idioms
once in a blue moon
CEFR B1Very rarely, almost never.
Neutral
blue ocean
CEFR C1an uncontested market space with no direct competitors
Neutral