Definitions
1.verbTo make something flat or flatter."As there was a lot of damage, we chose the heavy roller to flatten the pitch."
2.verbTo press one's body tightly against a surface, such as a wall or floor, especially in order to avoid being seen or harmed.
3.verbTo knock down or lay low."The prize fighter quickly flattened his challenger."
4.verbTo become flat or flatter; to plateau."Prices have flattened out."
5.verbTo be knocked down or laid low.
6.verbTo lower by a semitone.
7.verbTo make vapid or insipid; to render stale.
8.verbTo reduce (a data structure) to one that has fewer dimensions, e.g. a 2×2 array into a list of four elements.
9.verbTo combine (separate layers) into a single image.
10.nounThe act, or the result of making something flat of flatter
11.nounA flattened part of something"The Earth is a sphere that has flattenings at the poles."