Source : Webster's Revised Unabridged Dictionary (1913)

Necking \Neck"ing\, n.
   Same as {Neckmold}.

Neck \Neck\, v. t. [imp. & p. p. {Necked}; p. pr. & vb. n.
   {Necking}.] (Mech.)
   To reduce the diameter of (an object) near its end, by making
   a groove around it; -- used with down; as, to neck down a
   shaft.

Source : WordNet®

necking
     n 1: the molding at the top of a column [syn: {gorgerin}]
     2: affectionate play (or foreplay without contact with the
        genital organs) [syn: {caressing}, {cuddling}, {fondling},
         {hugging}, {kissing}, {petting}, {smooching}, {snuggling}]