Main Entry: flat·ten

Pronunciation: \ˈfla-t^ən\

Function: verb

Inflected Form(s): flat·tened; flat·ten·ing \ˈflat-niŋ, ˈfla-tə-\

Date: 1630

transitive verb : to make flat: 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 (as paint) lusterless e : to stabilize especially at a lower level intransitive verb : to become flat or flatter: 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

— flat·ten·er \-nər\ noun