The Collaborative International Dictionary of English v.0.48:

Bodyguard \Bod"y*guard`\, n.
   1. A guard or group of guards to protect or defend the
      person; a lifeguard.
      [1913 Webster]

   2. Retinue; attendance; following. --Bp. Porteus.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bodyguard
    n 1: someone who escorts and protects a prominent person [syn:
         bodyguard, escort]
    2: a group of men who escort and protect some important person