1. to make or become flat or flatter
2. to knock down or defeat completely
Usage: informal
3. to press against a surface

Examples

• She used a rolling pin to flatten the dough.
• The steamroller will flatten the asphalt.
• The boxer was flattened in the first round.
• The hurricane flattened several buildings.
• He flattened himself against the wall to hide.
• The tire went flat after hitting the nail.
• The strong winds flattened the wheat field.