v.
1.after a calculation, investigation, experiment, survey, or study
2.be careful or certain to do something
3.find out, learn, or determine with certainty, usually by making an inquiry or other effort
4.learn or discover with certainty
Idiom of the Day
day in and day out
regularly, all of the time
My father goes to a small restaurant for lunch day in and day out and he never gets tired of it.