narrow down

to reduce options, possibilities, choices, etc.

• That narrows it down.
• That narrows things down.
• We've got to narrow it down.
• Can you narrow that down a little?
• I've narrowed it down to three options.
• I'd say that narrows it down quite a bit.
• I've narrowed the list of possibilities down to three.
• I've narrowed it down to three different possibilities.
• After three full days of interviews we've narrowed it down to two candidates.