To boom means to make a loud, deep sound.
Analysts think the boom times are over now that so many people lost their jobs.

a material used to produce heat or power when burned
Farmers need fuel to run their tractors and other equipment.

a continual rise in the prices of products
inflation goes up every year, but if it goes up too quickly in a short amount of time, there is a problem.

the act of causing a break in something continuous
Agnes waited for the interruption to die down before she began her speech again.