To flatten something is to make it into a thin sheet or sheet of paper. You can flatten a piece of paper by pressing it down with your hand, or by using a machine.
The printer was flattening the paper as it was printing.
The cloth was being flattened by the machine.
verb
become flat or flatter
Synonyms:
verb
lower the pitch of (musical notes)
Synonyms:
verb
make flat or flatter
1
The body is elongate and flattened ventrally to the pelvic fins.
2
The carapace is oval and flattened.
3
The leaves are connate by flattened petioles.
4
The nucleus is flattened and located on the periphery.
5
The simplest fix is to flatten the hierarchy.
6
The top of the mountain is flattened and domelike.
7
These are the onsets of muscles that flatten the abdomen.
8
The forehead is flattened, and the bill is strong and pointed.
9
The pediment is flattened and the columns are widely spaced.
10
The carapace is flattened dorsally and highest anterior to the bridge.