narrow down
US /ˈnær.oʊ daʊn/
UK /ˈnær.oʊ daʊn/

1.
terugbrengen, beperken
to reduce the number of possibilities or choices
:
•
We need to narrow down the list of candidates to three.
We moeten de lijst met kandidaten terugbrengen tot drie.
•
The police are trying to narrow down the suspects.
De politie probeert de verdachten te beperken.