English · Phrasal verb Attested

flatten down

In real, traceable use. Part of the curated seed collection; community review is coming.

Meaning · English

To become or make (something) flat.

Where it’s used: Used American English

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Common questions

What does “flatten down” mean?

To become or make (something) flat.

Is “flatten down” formal or informal?

flatten down is generally informal.

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