skyrocket

the word 'skyrocket' is a transparent compound formed from two english nouns, 'sky' and 'rocket'. 'sky' originates from old norse 'ský', meaning 'cloud', which evolved in middle english to denote the heavens above. 'rocket' entered english in the early 17th century from italian 'rocchetta', a diminutive of 'rocca' meaning 'distaff', due to the cylindrical shape shared by both objects. the term was first used literally for a firework that ascends powerfully into the sky. by the early 20th century, this vivid imagery of rapid vertical ascent was metaphorically extended to describe any sudden and extreme increase, such as in prices or popularity.

Structure: sky + rocket - sky (old norse): the region of the atmosphere and outer space seen from the earth. in this compound, it denotes a high or upward direction. - rocket (italian via french): a cylindrical projectile or firework that can be propelled to a great height. in this compound, it denotes the object or action of rapid ascent.