Flatten

verb

1. To make something flat or flatter.

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

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. To knock down or lay low.

   "The prize fighter quickly flattened his challenger."

4. To become flat or flatter; to plateau.

   "Prices have flattened out."

5. To be knocked down or laid low.