n.
     - a broad piece of armour held by straps or a handle on one side, used for protection against blows or missiles. 
▸Heraldry  a stylized representation of a shield used for displaying a coat of arms.
 - a sporting trophy consisting of an engraved metal plate mounted on a piece of wood.
 - a US police officer's badge.
 - Geology  a large rigid area of Precambrian rock, unaffected by later crustal processes.
 - a person or thing providing protection. 
▸a protective plate, screen, or other structure.
 
v.
   - protect from a danger, risk, etc. 
▸enclose or screen (machinery) to protect the user.
 - prevent from being seen.
 - prevent or reduce the escape of sound, light, or other radiation from.
 
 
  Derivative
  
  Etymology
  OE scild (n.), scildan (v.), of Gmc origin, from a base meaning ‘divide, separate’.