What does "deep" mean?

See deep in WNW Idioms

go off the deep end

Informal
  1. to plunge rashly into an enterprise
  2. to become angry or excited

in deep water

in trouble or difficulty

the deep

Old Poet. the sea or ocean

See deep in American Heritage Dictionary 4 Idioms

deep down

At bottom; basically: Deep down, she was still a rebel.

in deep water

In difficulty.

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