adj.
    - extending far down or in from the top or surface. ▸extending a specified distance from the top, surface, or outer edge. ▸Cricket  (of a fielding position) relatively distant from the batsman. ▸(in ball games) to or from a position far down or across the field. 
- very intense, profound, or extreme:![]()  a deep sleep. ▸difficult to understand. 
- (of sound) low in pitch and full in tone; not shrill.
- (of colour) dark and intense.
n.
  - 
(the deep)
 literary the sea. ▸
(usu. deeps)
 a deep part of the sea. 
- 
(the deep)
 Cricket  the part of the field distant from the batsman.
adv.
 far down or in; deeply. 
▸(in sport) distant from the batsman or forward line of one's team.
Phrase
  
    - go off the deep end
 informal give way immediately to an emotional or irrational outburst.
- have deep pockets
 informal have a lot of financial resources.
- in deep water
 informal in trouble or difficulty.
- jump 
(or be thrown)
 in at the deep end
 informal face a new and difficult undertaking with little preparation.
 
  Derivative
  
  Etymology
  OE dēop (adj.), dīope, dēope (adv.), of Gmc origin; rel. to dip.