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deep2 W3
1 [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 (=very late).
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 (=very late).2
deep down
a) 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.
He knew, deep down, that he would have to apologise.b) 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.
Deep down, she is a caring person.3 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.
two/three etc deep
People were standing four deep at the bar.4 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.
run/go deep
The prejudice runs deep and we need to understand the fears behind it.5 to be very involved in a situation, especially so that it causes you problems
