(also, figuratively) Extending, reaching or positioned far from a point of reference, especially downwards.
(also, figuratively) Extending, reaching or positioned far from a point of reference, especially downwards.
(also, figuratively) Extending, reaching or positioned far from a point of reference, especially downwards.
(also, figuratively, in-compounds) Extending, reaching or positioned far from a point of reference, especially downwards.
(also, figuratively) Extending, reaching or positioned far from a point of reference, especially downwards.
(also, figuratively) Extending, reaching or positioned far from a point of reference, especially downwards.
(also, figuratively) Extending, reaching or positioned far from a point of reference, especially downwards.
(also, figuratively) Extending, reaching or positioned far from a point of reference, especially downwards.
(also, figuratively) Extending, reaching or positioned far from a point of reference, especially downwards.
(also, figuratively, often) Extending, reaching or positioned far from a point of reference, especially downwards.
Complex, involved.
Complex, involved.
Complex, involved.
Complex, involved.
Complex, involved.
Low in pitch.
Highly saturated; rich.
Sound, heavy (describing a state of sleep from which one is not easily awoken).
Muddy; boggy; sandy; said of roads.
Distant in the past, ancient.

Far, especially far down through something or into something, physically or figuratively.
In a profound, not superficial, manner.
In large volume.
Back towards one's own goal, baseline, or similar.

(countable, literary, uncountable, with-definite-article) The deep part of a lake, sea, etc.
(countable, uncountable, with-definite-article) The sea, the ocean.
(countable, uncountable) A deep hole or pit, a water well; an abyss.
(countable, uncountable) A deep or innermost part of something in general.
(countable, literary, uncountable, with-definite-article) A silent time; quiet isolation.
(countable, rare, uncountable) A deep shade of colour.
(US, countable, rare, uncountable) The profound part of a problem.
(countable, uncountable) A fielding position near the boundary.

(Multicultural-London-English, slang, transitive) To overthink; to treat as being deeper (“more profound, significant”) than in reality.
(Multicultural-London-English, slang, transitive) To think about, especially deeply (“profoundly”); to consider.