sparser russian

• разрежа́ться

  to thin out, to become sparser, to become rarefied

  to become less frequent, to come at longer intervals

Examples

• Лес, редевший с каждым годом, пугал местных жителей.

  The forest, which grew sparser with each passing year, frightened the local residents.

• Лес, разрежающийся ближе к горам, становился реже.

  The forest, becoming sparser closer to the mountains, grew less dense.