NOUN (4)

1. a loop in a rope;

2. a bend or curve (especially in a coastline);

3. a broad bay formed by an indentation in the shoreline;
- Example: "the Bight of Benin"
- Example: "the Great Australian Bight"

4. the middle part of a slack rope (as distinguished from its ends);


VERB (1)

1. fasten with a bight;

The Collaborative International Dictionary of English v.0.48:

Bight \Bight\ (b[imac]t), n. [OE. bi[yogh]t a bending; cf. Sw. &
   Dan. bugt bend, bay; fr. AS. byht, fr. b[=u]gan. [root]88.
   Cf. Bout, Bought a bend, and see Bow, v.]
   1. A corner, bend, or angle; a hollow; as, the bight of a
      horse's knee; the bight of an elbow.
      [1913 Webster]

   2. (Geog.) A bend in a coast forming an open bay; as, the
      Bight of Benin.
      [1913 Webster]

   3. (Naut.) The double part of a rope when folded, in
      distinction from the ends; that is, a round, bend, or coil
      not including the ends; a loop.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bight
    n 1: a loop in a rope
    2: a bend or curve (especially in a coastline)
    3: a broad bay formed by an indentation in the shoreline; "the
       Bight of Benin"; "the Great Australian Bight"
    4: the middle part of a slack rope (as distinguished from its
       ends)
    v 1: fasten with a bight