prep.
 & 
adv.
       - at or to the far side of. 
▸hidden by.
 - further back than other members of a moving group.
 - in support of or giving guidance to. 
▸guiding, controlling, or responsible for (an event or plan).
 - after the departure or death of.
 - less advanced than in achievement or development.
 - having a lower score than (another competitor).
 - late in accomplishing a task. 
▸in arrears.
 
n.
  - informal a person's bottom.
 - Australian Rules  a kick that sends the ball over a behind line, or a touch that sends it between the inner posts, scoring one point.
 
 
  Phrase
  
    
      - behind the curve
 see ahead of the curve at ahead. 
    
   
  Etymology
  OE behindan, bihindan, from bi ‘by’ + hindan ‘from behind’.