Definition from macmillandictionary.com
Your browser doesn’t support HTML5 audio
The building has a flat roof.
You need a flat surface to work on.
The farmland is very flat.
a firm flat stomach
a monitor with a flat screen
She put the fruit on a large flat plate.
Stand with your feet flat on the floor.
She was flat on her back asleep.
The bank charges a flat fee of £5 for money transfers.
Ben’s voice was curiously flat when he told us the news.
The victory celebrations seemed rather flat.
a flat refusal
It was a flat statement of fact, with no apology.
Many companies are adopting a flatter management structure.
August was a flat month.