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The river is quite deep here.
an area of high hills and deep valleys
How deep is the snow?
The pond needs to be at least a metre deep.
He had a deep cut on his forehead.
By this time we were deep inside enemy territory.
a small cabin deep in the woods
Her husband seemed deep in conversation with Mrs Beeley.
He was deep in thought, oblivious to all the noise around him.
He believes in throwing new recruits in at the deep end.
This is the British English definition of deep. View American English definition of deep.