flatten

1 ENTRIES FOUND:
flatten /ˈflætn̩/ verb
flattens; flattened; flattening
flatten
/ˈflætn̩/
verb
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