adjective
deeper; -est
having a large distance to the bottom from the surface or highest point
going far inward from the outside or the front edge of something
located far inside something - usually + in or within
not used before a noun :having a specified measurement downward, inward, or backward
located near the outside edges of an area
hit, thrown, or kicked a long distance
done by taking in or breathing out a large amount of air
low in sound or musical pitch
having a dark, strong color
very intelligent and serious but complex or difficult to understand
full of mystery
completely involved in an activity :concentrating and giving all of your attention to something - + in
affected by something in a very serious way - + in
very bad, serious, or severe
very strongly felt
full, complete, or thorough
If you are in a deep sleep, you are thoroughly asleep and it is hard to wake you up.
US :going down to a very low price, level, etc.
US sports :having many good players
in deep water
in a difficult situation :in trouble
the deep end
informal
used in phrases like throw in (at) the deep end and jump in (at) the deep end to describe starting a new and difficult activity when you are not fully prepared or ready to do it
To go off the deep end is to go crazy, such as by behaving foolishly or by becoming very angry or upset.
adverb
deeper; -est
far into or below the surface of something
far into or inside something
not used before a noun :at a specified measurement downward, inward, or backward
to a late time
sports
near the outside edges of a playing area
for a long distance
If you breathe deep, you take a large amount of air into your lungs.
deep down (inside)
If you feel or believe something deep down or deep down inside, you feel or believe it completely even if you do not say it or show it to other people.
in (too) deep
informal :in a difficult situation that you cannot get out of
run deep
to be felt very strongly
noun
the deep
literary + formal :the ocean
literary :the middle part of something
the deeps
literary + formal :the deep parts of the ocean