narrow
nar-row
adjective
Having a small width, especially in comparison to length or surroundings.
"The lane was too narrow for two cars."
verb
To become or make something smaller in width or more restricted in scope.
"The path narrows as you approach the river."
Thesaurus
Synonyms: specialise, specialize, narrow down, constringe, constrict, marginal, bare, dogmatical, petty, closed-minded, self-opinionated, dogmatic
Antonyms: branch out, broad, broad-minded, broaden, diversify, wide, widen