flatten

verb

1. 1

   To make something flat or flatter.

   “As there was a lot of damage, we chose the heavy roller to flatten the pitch.”

2. 2

   To press one's body tightly against a surface, such as a wall or floor, especially in order to avoid being seen or harmed.

3. 3

   To knock down or lay low.

   “The prize fighter quickly flattened his challenger.”

4. 4

   To become flat or flatter; to plateau.

   “Prices have flattened out.”

5. 5

   To be knocked down or laid low.

6. 6

   To lower by a semitone.

7. 7

   To make vapid or insipid; to render stale.

8. 8

   To reduce (a data structure) to one that has fewer dimensions, e.g. a 2×2 array into a list of four elements.

9. 9

   To combine (separate layers) into a single image.