narrow

(transitive) To reduce in width or extent; to contract.

(intransitive) To get narrower.

(of a person or eyes) To partially lower one's eyelids in a way usually taken to suggest a defensive, aggressive or penetrating look.

(knitting) To contract the size of, as a stocking, by taking two stitches into one.

(transitive, programming) To convert to a data type that cannot hold as many distinct values.