v.
1.defend, explain, clear away, or make excuses for by reasoning
2.weed out unwanted or unnecessary things
3.structure and run according to rational or scientific principles in order to achieve desired results
4.think rationally
5.remove irrational quantities from
Idiom of the Day
know one's way around/about
to know how to get something done, to know about something
My friend knows his way around the city very well.