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Meaning of blue hole | Babel Free

Noun CEFR B2

Definitions

A submarine cave or sinkhole, a roughly circular, steep-walled depression that is typically anoxic below a certain depth.

CEFR level

B2

Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

blue hook star blue hour Blue House blue hydrogen blue ice blue iceberg