rank1
  
  n.
        - a position within a fixed hierarchy, especially that of the armed forces.
- high social standing.
- a single line of soldiers or police officers drawn up abreast. ▸a regular row or line of things or people. 
- 
(the ranks)
 (in the armed forces) those who are not commissioned officers.
- 
(ranks)
 the people belonging to or constituting a group or class:![]()  the ranks of the unemployed. 
- Chess  each of the eight rows of eight squares running from side to side across a chessboard. Compare with file2 (in sense 3).
- Brit. short for taxi rank.
- Mathematics  the value or the order of the largest non-zero determinant of a given matrix.
v.
    - give (someone or something) a rank within a grading system.
- hold a specified rank.
- US take precedence over (someone) in respect to rank.
- arrange in a row or rows.
Phrase
  
    - break rank 
(or ranks)
 - (of soldiers or police officers) fail to remain in line.
- fail to maintain solidarity.
 
- close ranks
 - (of soldiers or police officers) come closer together in a line.
- unite in order to defend common interests.
 
- pull rank
 take unfair advantage of one's seniority.
 
  Etymology
  ME: from OFr. ranc, of Gmc origin; rel. to ring1.
 
  
    
rank2
  
  adj.
   - having a foul smell. ▸informal very unpleasant. 
- (especially of something bad) complete; utter:![]()  rank stupidity. 
- (of vegetation) growing too thickly.
Derivative
  
  Etymology
  OE ranc ‘proud, rebellious, sturdy’, also ‘fully grown’, of Gmc origin.