B1
Narrow things measure a small distance from one side to the other.
Dictionary examples:
The narrow window lets in just enough light to see my mistakes. (0.0)
My narrow kitchen is so small, I can cook and wash dishes simultaneously. (0.0)
My cat thinks he's fat, but he can squeeze through a narrow gap. (0.0)
narrow streets (22.3)
narrow feet (23.5)
a narrow face (25.8)
a narrow bridge/doorway/path (53.7)