Synonyms: narrow, narrow down, specialise, specialize
Definition: become more focus on an area of activity or field of study
Usage: She specializes in Near Eastern history
Similar words: vary, change, alter
Definition: become different in some particular way, without permanently losing one's or its former characteristics or essence
Usage: her mood changes in accordance with the weather; The supermarket's selection of vegetables varies according to the season
Synonyms: pin down, peg down, nail down, narrow, narrow down, specify
Definition: define clearly
Usage: I cannot narrow down the rules for this game
Similar words: determine
Definition: fix in scope; fix the boundaries of
Usage: the tree determines the border of the property