This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of narrow.

n. The part of a stocking that is narrowed.

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

n. The part of a stocking which is narrowed.

n. In knitting, the act of reducing the breadth of the work, as by throwing two stitches into one.

n. The part of the work which has been thus narrowed or contracted.

n. a decrease in width

n. the act of making something narrower

adj. becoming gradually narrower

adj. (of circumstances) tending to constrict freedom

n. an instance of becoming narrow

"I always follow the map and, having kicked myself for failing to direct us off onto smaller roads at a previous junction, noted a thin white line of track that bypassed what I assumed was the problem – the road narrowing from a dual to a single carriageway quite three miles up ahead."

narrow   

decrease    decrement    change of shape   

constriction    contraction   

narrow   

harrowing