Synonyms for «to narrow something»

Synonyms for individual words can be found below.

You have 100 ideas and you need help narrowing it down. (businessboutique.com)
There are times where the 4C is enjoyable, but the window is so narrow you rarely get to appreciate it. (evo.co.uk)
There were so many items, I was having a hard time narrowing it down. (healthyseasonalrecipes.com)
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