con·voy /ˈkɑnˌvɔɪ, kənˈ/
 護送,護衛,警護(vt.)護航,護送
 Con·voy v. t. [imp. & p. p. Convoyed p. pr. & vb. n. Convoying.]  To accompany for protection, either by sea or land; to attend for protection; to escort; as, a frigate convoys a merchantman.
 I know ye skillful to convoy
 The total freight of hope and joy.   --Emerson.
 Con·voy n.
 1. The act of attending for defense; the state of being so attended; protection; escort.
    To obtain the convoy of a man-of-war.   --Macaulay.
 2. A vessel or fleet, or a train or trains of wagons, employed in the transportation of munitions of war, money, subsistence, clothing, etc., and having an armed escort.
 3. A protection force accompanying ships, etc., on their way from place to place, by sea or land; an escort, for protection or guidance.
 When every morn my bosom glowed
 To watch the convoy on the road.   --Emerson.
 4. Conveyance; means of transportation. [Obs.]
 5. A drag or brake applied to the wheels of a carriage, to check their velocity in going down a hill.
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 convoy
      n 1: a procession of land vehicles traveling together
      2: a collection of merchant ships with an escort of warships
      3: the act of escorting while in transit
      v : escort in transit; "the trucks convoyed the cars across the
          battle zone"; "the warships convoyed the merchant ships
          across the Pacific"