NOUN (2)

1. a wooden or metal staff that fits under the armpit and reaches to the ground; used by disabled person while walking;

2. anything that serves as an expedient;
- Example: "he uses drugs as a psychological crutch"

The Collaborative International Dictionary of English v.0.48:

Crutch \Crutch\, v. t.
   To support on crutches; to prop up. [R.]
   [1913 Webster]

         Two fools that crutch their feeble sense on verse.
                                                  --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Crutch \Crutch\ (kr[u^]ch; 224), n.; pl. Crutches (-[e^]z).
   [OE. crucche, AS. crycc, cricc; akin to D. kruk, G.
   kr["u]cke, Dan. krykke, Sw. krycka, and to E. crook. See
   Crook, and cf. Cricket a low stool.]
   1. A staff with a crosspiece at the head, to be placed under
      the arm or shoulder, to support the lame or infirm in
      walking.
      [1913 Webster]

            I'll lean upon one crutch, and fight with the other.
                                                  --Shak.
      [1913 Webster]

            Rhyme is a crutch that lifts the weak alone. --H.
                                                  Smith.
      [1913 Webster]

   2. A form of pommel for a woman's saddle, consisting of a
      forked rest to hold the leg of the rider.
      [1913 Webster]

   3. (Naut.)
      (a) A knee, or piece of knee timber.
      (b) A forked stanchion or post; a crotch. See Crotch.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Crotch \Crotch\ (kr[o^]ch; 224), n.; pl. Crotches
   (kr[o^]ch"[e^]z). [Cf. Crotchet, Crutch.]
   1. The angle formed by the parting of two legs or branches; a
      fork; the point where a trunk divides; as, the crotch of a
      tree. more specifically, the space on the human torso
      between the two legs; also, the corresponding part between
      the legs of a pair of pants, which is in contact with the
      crotch of the wearer; as, pants with a tight crotch have
      become very popular.
      [1913 Webster +PJC]

   2. (Naut.) A stanchion or post of wood or iron, with two arms
      for supporting a boom, spare yards, etc.; -- called also
      crane and crutch. --Totten.
      [1913 Webster]

   3. (Billiards) In the three-ball carom game, a small space at
      each corner of the table. See Crotched, below.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

crutch
    n 1: a wooden or metal staff that fits under the armpit and
         reaches to the ground; used by disabled person while
         walking
    2: anything that serves as an expedient; "he uses drugs as a
       psychological crutch"