Pronunciation: /diːp siː/
noun a vast expanse of ocean located at great depths
A1 The deep sea is home to many mysterious creatures.
A2 Exploring the deep sea requires specialized equipment.
B1 Scientists study the deep sea to learn more about marine life.
B2 The deep sea is a fascinating and unexplored world.
C1 Research expeditions to the deep sea can uncover new species.
C2 The deep sea holds many secrets waiting to be discovered.
adjective describing something that is located or found at great depths in the ocean
A1 The deep sea creatures are fascinating to learn about.
A2 Exploring the deep sea requires special equipment and training.
B1 Scientists have discovered new species in the deep sea that were previously unknown.
B2 The deep sea is a mysterious and largely unexplored part of our planet.
C1 Research expeditions to the deep sea are essential for understanding marine ecosystems.
C2 The deep sea is home to a wide variety of unique and fascinating creatures.
formal Scientists are conducting research on deep sea ecosystems to better understand marine life.
informal I love watching documentaries about the deep sea and all the mysterious creatures that live there.
slang Diving into the deep sea is like exploring another world!
figurative Her thoughts were like a deep sea, filled with hidden depths and mysteries.
deep seas
deeper sea
deepest sea
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has been deep sea
is being deep sea
deep sea
deep sea
to deep sea
deep-sea fishing
deep-sea diver