n.
  - a small individual feature, fact, or item. ▸a small part of a picture reproduced separately for close study. 
- a small detachment of troops or police officers given a special duty. ▸a special duty assigned to such a detachment. 
v.
  - describe item by item; give the full particulars of.
- assign to undertake a particular task.
Phrase
  
    - go into detail
 give a full account of something.
- in detail
 as regards every feature or aspect; fully.
 
  Etymology
  C17: from Fr. détail (n.), détailler (v.), from dé- (expressing separation) + tailler ‘to cut’.