To make something flat or flatter.
As there was a lot of damage, we chose the heavy roller to flatten the pitch.
To press one's body tightly against a surface, such as a wall or floor, especially in order to avoid being seen or harmed.
With a bolt of fright he remembered that there was no bathroom in the Hob-house Room. He leapt along the corridor in a panic, stopping by the long-case clock at the end where he flattened himself against the wall.
To knock down or lay low.
The prize fighter quickly flattened his challenger.
From flat + -en.
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