"Narrowing down" a list means to get rid of some of the items on the list. "Narrowing down" a list is usually considered to be a good thing, because it makes it easier for you to make a decision when there are fewer choices.

Here are some of the words most commonly used after "narrow down":

• narrow down a list
• narrow down your choices
• narrow down the suspects (of a crime)
• narrow down the possibilities