pen1
  
  n.
  - an instrument for writing or drawing with ink, typically consisting of a metal nib or ball, or a nylon tip, fitted into a metal or plastic holder. 
▸
(the pen)
 writing as an occupation.
 ▸an electronic device used in conjunction with a writing surface to enter commands or data into a computer.
 - Zoology  the tapering cartilaginous internal shell of a squid.
 
v.
 (pens, penning, penned)
 write or compose.
 
  Phrase
  
    
      - pen and ink
 Brit. rhyming slang a stink. 
    
   
  Etymology
  ME (orig. denoting a feather with a sharpened quill): from OFr. penne, from L. penna ‘feather’.
 
  
    
pen2
  
  n.
   - a small enclosure in which sheep, pigs, or other farm animals are kept.
 - a covered dock for a submarine or other warship.
 - (in the West Indies) a farm or plantation.
 
v.
 (pens, penning, penned)
  - put or keep in a pen.
 - 
(pen someone up/in)
 confine someone in a restricted space.
 
 
  Etymology
  OE penn, of unknown origin.