/ ˈflætn; NAmE / verb
1.
to become or make sth become flat or flatter :
[ v ]
The cookies will flatten slightly while cooking.
[ vn ]
These exercises will help to flatten your stomach.
He flattened his hair down with gel.
2.
[ vn ] to destroy or knock down a building, tree, etc. :
Most of the factory was flattened by the explosion.
3.
[ vn ] ( informal ) to defeat sb easily in a competition, an argument, etc.
SYN smash , thrash :
Our team was flattened this evening!
4.
[ vn ] ( informal ) to hit sb very hard so that they fall down :
He flattened the intruder with a single punch.
I'll flatten you if you do that again!
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PHRASAL VERBS
- flatten sth / yourself against / on sb/sth
- flatten out
- flatten sth out