Meaning of “narrow” - Learner’s Dictionary

narrow

adjective uk us /ˈnærəʊ/
NOT WIDE

B1 Narrow things measure a small distance from one side to the other:

a narrow lane/street
a narrow tie
FEW

including only a small number:

He has very narrow interests.
a narrow defeat/victory

If you have a narrow defeat/victory, you only just lose/win.

a narrow escape

If you have a narrow escape, you only just avoid danger.

(Definition of “narrow adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)