1. the act or process of making something flat or flatter
2. the state of becoming flat or flatter

1. present participle of flatten; making or becoming flat

Examples

• The flattening of the dough took several minutes with the rolling pin.
• Road construction required the flattening of the hillside.
• The tire showed signs of flattening after hitting the pothole.
• She was flattening the cardboard boxes for recycling.
• The flattening of the curve became important during the pandemic.
• Heavy books were flattening the pressed flowers.
• The storm caused a flattening of the wheat fields.