Meaning
To reduce the number of possibilities or options.
Example Sentence
"We need to narrow down the list of candidates to just three."
Synonyms
reduce
limit
restrict
whittle down
Usage Note
This phrasal verb is separable. When using a noun object, it can go between the verb and particle or after the particle. When using a pronoun object, it must go between the verb and particle (e.g., "turn it off" not "turn off it").