Collins English-English Dictionary

deep [diːp]

1. 1. adj extending or situated relatively far down from a surface

   a deep pool

2. 2. adj extending or situated relatively far inwards, backwards, or sideways

   a deep border of trees

3. 3. adj [cricket] relatively far from the pitch

   the deep field

   deep third man

4. 4. adj [postpositive] of a specified dimension downwards, inwards, or backwards

   six feet deep

5. 5. adj (in combination)

   a six-foot-deep trench

6. 6. adj coming from or penetrating to a great depth

   a deep breath

7. 7. adj difficult to understand or penetrate; abstruse

8. 8. adj learned or intellectually demanding

   a deep discussion

9. 9. adj of great intensity; extreme

   deep happiness

   deep trouble

10. 10. adj [postpositive; foll by in] absorbed or enveloped (by); engrossed or immersed (in)

    deep in study

    deep in debt

11. 11. adj very cunning or crafty; devious

    a deep plot

12. 12. adj mysterious or obscure

    a deep secret

13. 13. adj (of a colour) having an intense or dark hue

14. 14. adj low in pitch or tone

    a deep voice

15. 15. adj See end

16. 16. n any deep place on land or under water, esp below 6000 metres (3000 fathoms)

17. 17. n a poetic term for the ocean

18. 18. n the most profound, intense, or central part

    the deep of winter

19. 19. n a vast extent, as of space or time

20. 20. n [nautical] one of the intervals on a sounding lead, one fathom apart

21. 21. adv far on in time; late

    they worked deep into the night

22. 22. adv profoundly or intensely

23. 23. adv [Etymology] Old English deop; related to Old High German tiof deep, Old Norse djupr