Source : Webster's Revised Unabridged Dictionary (1913)

   {Cylinder face} (Steam Engine), the flat part of a steam
      cylinder on which a slide valve moves.

   {Face of an anvil}, its flat upper surface.

   {Face of a bastion} (Fort.), the part between the salient and
      the shoulder angle.

   {Face of coal} (Mining), the principal cleavage plane, at
      right angles to the stratification.

   {Face of a gun}, the surface of metal at the muzzle.

   {Face of a place} (Fort.), the front comprehended between the
      flanked angles of two neighboring bastions. --Wilhelm.

   {Face of a square} (Mil.), one of the sides of a battalion
      when formed in a square.

   {Face of a} {watch, clock, compass, card etc.}, the dial or
      graduated surface on which a pointer indicates the time of
      day, point of the compass, etc.

   {Face to face}.
       (a) In the presence of each other; as, to bring the
           accuser and the accused face to face.
       (b) Without the interposition of any body or substance.
           ``Now we see through a glass darkly; but then face to
           face.'' 1 --Cor. xiii. 12.
       (c) With the faces or finished surfaces turned inward or
           toward one another; vis [`a] vis; -- opposed to {back
           to back}.

   {To fly in the face of}, to defy; to brave; to withstand.

   {To make a face}, to distort the countenance; to make a
      grimace. --Shak.

Source : WordNet®

face to face
     adv : involving close contact; confronting each other; "the boy
           and the policeman suddenly came face-to-face at the
           corner"; "they spoke facel to face"