phrases used to describe numbers/movement

Skyrocket

Shoot up dramatically

“The stock market skyrocketed after the finance minister made his speech.”

Spike

A rapid increase immediately followed by a rapid decrease back to the previous level

“There is a spike in the orders on the 5th of every month when our largest customer places its monthly order.”

Can also be used as a verb: “the orders spike on the 5th of every month”

Flat

Stable, no increase or decrease

“PC sales have been flat for the last three months because consumers are expecting prices to drop after Christmas.”

Tumble

Fall

“Inoue-san will explain why the stock market took a tumble in October.”

Can also be used as a verb: “the stock market tumbled in October”

Dive

A dramatic decrease

“If we introduce our new model now, sales of the old model will dive.”