资料来源 : Webster's Revised Unabridged Dictionary (1913)

Rub \Rub\, v. i.
   1. To move along the surface of a body with pressure; to
      grate; as, a wheel rubs against the gatepost.

   2. To fret; to chafe; as, to rub upon a sore.

   3. To move or pass with difficulty; as, to rub through woods,
      as huntsmen; to rub through the world.

   {To rub along} or {on}, to go on with difficulty; as, they
      manage, with strict economy, to rub along. [Colloq.]