v.1. To put something on the surface of something: They set the boxes down on the floor. I set down my book and closed my eyes.
2. To put something in writing; record something: I set down some ideas for a novel. The committee set their findings down in a report.
3. To land some aircraft: The pilot set the plane down hard. She found a clearing and set down the helicopter.
4. To land: The plane set down at a small airport outside the city.
5. Baseball To put out some batter; retire someone. Used of a pitcher: The pitcher set down the first two hitters. The hitter stepped up to the plate, and the pitcher set him down with a fastball.
6. set down as To regard someone as something: They set her down as a liar and never trusted her again.
7. set down to To attribute some event to some cause: Let's set the error down to inexperience.