from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instance of slapping down, especially a humiliation or rejection.
- n. The period after the initial impact of an object with a surface through the subsequent impact of the object on that surface, as an aircraft landing or a container falling.
- n. The impact of a layer of earth falling after having been lifted by an explosion or an earthquake or similar large-scale disturbance.
From slap + down. (Wiktionary)