(transitive) To make something flat or flatter. / (reflexive) To press one's body tightly against a surface, such as a wall or floor, especially in order to avoid being seen or harmed.

Third-person singular simple present indicative form of flatten

present participle of flatten

The act, or the result of making something flat or flatter / A flattened part of something

Made flat by something.

simple past tense and past participle of flatten

plural of flattening

Capable of being flattened.

plural of flattener

Anything that flattens. / (finance) A trade whose terms are based on the assumption that the rate of return will decrease.