firmer russian

• упро́чивающийся

  strengthening, consolidating, becoming firmer, becoming stronger

• подтяну́вший

  having pulled up, having tightened

  having toned up, having made firmer

Examples

• Мышцы спортсмена стали упругими после тренировок.

  The athlete's muscles became firmer after training.

• Со временем растение врастает в почву крепче.

  Over time, the plant takes firmer root in the soil.

• Матрас, подкачиваемый насосом, постепенно становился твёрже.

  The mattress being inflated with a pump gradually became firmer.

• Матрас, подкачивавшийся вечером, стал плотнее.

  The mattress that was pumped up in the evening became firmer.