Meaning of NARROW in English
[verb]The road narrows (= becomes less wide) after the bridge. [I]He narrowed (= almost closed) his eyes in suspicion. [T](figurative) The gap between the main contenders for the presidency narrows (= becomes smaller) every day. [I]They have narrowed (= limited) the focus of the investigation, to concentrate on younger adults. [T]To narrow down something, such as a list, is to make it smaller and clearer by taking out the least important.We narrowed the list of candidates down from ten to three.
Cambridge English vocab. Кембриджский английский словарь. 2012