narrow-v; 2 Senses

Sense Number 1: make or become more restricted (in scope)

Commentary: Syntax Is: NP1 NARROW (NP2[patient[abstract]]) Includes: NARROW_DOWN

The selection was narrowed.
At least we've narrowed it down to mammalian.
I cannot narrow down the rules to this game.
The trade gap narrowed to $62 billion in March.

VerbNet: other_cos-45.4
FrameNet: NM
PropBank: narrow.01
WordNet 3.0 Sense Numbers: 1, 2, 3
WordNet Verb Particle Constructions, Multiword Expressions:
narrow_down 1, 2

Sense Number 2: make or become tighter (spatially)

Commentary: Syntax Is: NP1 NARROW (NP2[patient[concrete]])

The road narrowed some.
The passage narrowed and her head brushed the low ceiling.
They then found that if they narrowed the flue they could get rid of the frying sound.

VerbNet: NM
FrameNet: Cause_expansion
PropBank: NM
WordNet 3.0 Sense Numbers: 4