The Collaborative International Dictionary of English v.0.48:

Fay \Fay\ (f[=a]), v. t. [imp. & p. p. fayed; p. pr. & vb. n.
   Faying.] [OE. feien, v.t. & i., AS. f[=e]gan to join,
   unite; akin to OS. f[=o]gian, D. voegen, OHG. fuogen, G.
   f["u]gen, Sw. foga. See Fair, and cf. Fadge.]
   (Shipbuilding)
   To fit; to join; to unite closely, as two pieces of wood, so
   as to make the surface fit together.
   [1913 Webster]