[1] : The Collaborative International Dictionary of English v.0.48

helm \helm\, n. oe. helme, as. helma rudder; akin to d.  g.
   helm, icel. hj=alm, and perh. to e. helve.
   1913 webster
   1. naut. the apparatus by which a ship is steered,
      comprising rudder, tiller, wheel, etc.; -- commonly used
      of the tiller or wheel alone.
      1913 webster

   2. the place or office of direction or administration. "the
      helm of the commonwealth." --melmoth.
      1913 webster

   3. one at the place of direction or control; a steersman;
      hence, a guide; a director.
      1913 webster

            the helms o' the state, who care for you like
            fathers.                              --shak.
      1913 webster

   4. cf. helve. a helve. obs. or prov. eng.
      1913 webster

   helm amidships, when the tiller, rudder, and keel are in
      the same plane.

   helm aport, when the tiller is borne over to the port side
      of the ship.

   helm astarboard, when the tiller is borne to the starboard
      side.

   helm alee, helm aweather, when the tiller is borne over
      to the lee or to the weather side.

   helm hard alee, helm hard aport, helm hard astarboard,
      etc., when the tiller is borne over to the extreme limit.
      

   helm port, the round hole in a vessel's counter through
      which the rudderstock passes.

   helm down, helm alee.

   helm up, helm aweather.

   to ease the helm, to let the tiller come more amidships, so
      as to lessen the strain on the rudder.

   to feel the helm, to obey it.

   to right the helm, to put it amidships.

   to shift the helm, to bear the tiller over to the
      corresponding position on the opposite side of the vessel.
      --ham. nav. encyc.
      1913 webster
see also:
helve helm amidships helm aport helm astarboard helm alee helm aweather 
helm hard alee helm hard aport helm hard astarboard helm port helm down 
helm up to ease the helm to feel the helm to right the helm to shift the helm 

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