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Webster 1913 Edition

Noun.

The act of contracting, or of making or becoming less in breadth or extent.

The part of a stocking which is narrowed.

ppr.

Contracting; making less broad.

narrowing

narrowing ‎(plural narrowings)

The part of a stocking that is narrowed.
- 1858, Margaret Maria Gordon, Household economy (page 60)
  It may be observed, as a general rule, that the length of a stocking, before the narrowings, should be, at the least, equal to twice the width of the top...