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deep(adjective)

going or being far down or far into

a deep lake; a deep wound.

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deep(adjective)

going or being far down by a named amount

a hole six feet deep.

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deep(adjective)

occupied or involved to a great extent

He is deep in debt.

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deep(adjective)

intense; strong

The sea is a deep blue colour; They are in a deep sleep.

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deep(adjective)

low in pitch

His voice is very deep.

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deep(adverb)

far down or into

deep into the wood.