The clumpers rearranged the leaves into neat piles before the festival.

She added a clumper of native grass to the wetland restoration site to help reduce runoff.

In damp weather the moss will clumper atop the garden stones, giving them a soft, uneven look.

After the mixer ran too long, the dough clumpered into a dense mass, ruining the texture.

The gardener frowned as the wet soil kept clumpering in his gloved hands, making it hard to sow the seeds.