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
mark up (a price) or mark (a price) up
to raise the price of something
The store marked up the price of the camping equipment at the beginning of the summer.