has been clumping

• present perfect progressive

  present perfect progressive

  Used to describe an action that began in the past, has continued continuously, and is still in progress.

  of clump (3rd person singular).
  clump

  noun

  a small, close group or cluster, especially of trees or other plants.

Related Words

• blob
• bundle
• chunk
• cluster
• hunk
• jumble
• knot
• lump
• wad