The dried, wrinkled fruit of certain species of plum.

(figurative) Something wrinkly like a prune.

(slang) An old woman, especially a wrinkly one.

(intransitive, informal) To become wrinkled like a dried plum, as the fingers and toes do when kept submerged in water.

(transitive, horticulture) To remove excess material from a tree or shrub; to trim, especially to make more healthy or productive.

(transitive, figurative) To cut down or shorten (by the removal of unnecessary material).

(transitive, computer science) To remove unnecessary branches from a tree data structure.