flattens;
flattened;
flattening
flattens;
flattened;
flattening
Britannica Dictionary definition of FLATTEN
1
a
[+ object]
:
to make (something) flat or flatter
b
[no object]
:
to become flat or flatter
2
[+ object]
a
:
to knock down (something or someone)
b
informal
:
to defeat (a competitor) easily or completely
3
[no object]
:
to go to and stay at a lower level
—
often + out