- 1[intransitive, transitive] to become or make something become flat or flatter The cookies will flatten slightly while cooking. flatten something These exercises will help to flatten your stomach. He flattened his hair down with gel. The bird is recognizable by its flattened beak. Roll the dough into balls and flatten slightly.
- 2[transitive] flatten something to destroy or knock down a building, tree, etc. Most of the factory was flattened by the explosion. The hurricane flattened thousands of homes.
- 3[transitive] flatten somebody (informal) to defeat somebody easily in a competition, an argument, etc. synonym smash, thrash Our team was flattened this evening!
- 4[transitive] flatten somebody (informal) to hit somebody very hard so that they fall down He flattened the intruder with a single punch. I'll flatten you if you do that again! Phrasal Verbsflatten something on somebodyflatten outflatten somethingout
BrE BrE//ˈflætn//; NAmE NAmE//ˈflætn//Verb Forms present simple I / you / we / they flatten
BrE BrE//ˈflætn//; NAmE NAmE//ˈflætn//he / she / it flattens
BrE BrE//ˈflætnz//; NAmE NAmE//ˈflætnz//past simple flattened
BrE BrE//ˈflætnd//; NAmE NAmE//ˈflætnd//past participle flattened
BrE BrE//ˈflætnd//; NAmE NAmE//ˈflætnd//-ing form flattening
BrE BrE//ˈflætnɪŋ//; NAmE NAmE//ˈflætnɪŋ//