Definition of flatten
flattened;
flattening
play
\ˈflat-niŋ, ˈfla-tə-\
: to make flat: such as
a
: to make level or smooth
b
: to knock down;
also
: to defeat decisively
c
: to make dull or uninspired
—often used with out
d
: to make lusterless
- flatten paint
e
: to stabilize especially at a lower level
: to become flat or flatter: such as
a
: to become dull or spiritless
b
: to extend in or into a flat position or form
c
: to become uniform or stabilized often at a new lower level
—usually used with out
