How to use
always + adverb/preposition
a long way into or below the surface of something
Some bones were hidden deep beneath the ground.
The tunnel led deep under the mountains.
We were deep in a tropical rainforest
far from the edge of the forest
Tom stared deep into her eyes.
They talked deep into the night
if you know or feel something deep down, you secretly know or feel it even though you do not admit it
He knew, deep down, that he would have to apologise.
if someone is good, evil etc deep down, that is what they are really like even though they usually hide it
Deep down, she is a caring person.
two/three etc deep
if things or people are two deep, three deep etc, there are two, three etc rows or layers of things or people
People were standing four deep at the bar.
if a feeling such as hatred or anger runs deep in someone, they feel it very strongly, especially because of something that has happened in the past
The prejudice runs deep and we need to understand the fears behind it.
be in (too) deep
to be very involved in a situation, especially so that it causes you problems
➔ still waters run deep
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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