n.
 (pl. buddies)
 a close friend. 
▸a working companion with whom close cooperation is required.
 ▸a person who befriends and helps an Aids sufferer.
v.
 (buddies, buddying, buddied)
 
(
often buddy up with/to)
 become friendly with.
 
  Etymology
  C19: perh. an alt. of brother, or a var. of butty2.