Real Dictionary

caper
A dishonest or illegal activity can be referred to as a caper.
Capers are the small green buds of caper plants. They are usually sold preserved in vinegar.
verb: If you caper about, you run and jump around because you are happy or excited.

caper in American English 1
a playful jump or leap
to skip or jump about in a playful manner; frisk; gambol
intransitive verb: to leap or skip about in a sprightly manner; prance; frisk; gambol
noun: a playful leap or skip

caper in American English 2
any of a genus (Capparis) of trees and shrubs of the caper family, esp. a prickly, trailing Mediterranean bush ( C. spinosa) whose tiny, green flower buds are pickled and used to flavor sauces, etc.
designating a family (Capparaceae) of dicotyledonous plants (order Capparales), including the bee plant and cleome
noun: a spiny shrub, Capparis spinosa, of Mediterranean regions, having roundish leaves and solitary white flowers

caper in British English 1
noun: a playful skip or leap
verb: to leap or dance about in a light-hearted manner

caper in British English 2
noun: a spiny trailing Mediterranean capparidaceous shrub, Capparis spinosa, with edible flower buds