"hot up" is a correct and usable phrase in written English.
It typically means to make something more intense, stimulating, or active. For example, "With the summer months approaching, the competition between businesses to attract customers is sure to hot up."
"Things are hot up ahead.
I'm just waiting for it to hot up".
Now, in the estimation of one very senior member of the cabinet: "It's about to really hot up".
Well, shortly they are going to get a piece of paper, another signal that things are about to "hot up".
When there is no shortage, competition will hot up and their profits will shrink.Added attractionsMiddlemen throughout the industry (and in many other industries too) can expect leaner times.
(Though, judging by Google News, there hasn't been a great deal of press generated so far; maybe things will hot up as the day progresses).
It retains its razor-sharp edge with local bands like the hot up-and-comers Washington Social Club.
Besides the requisite line-up of familiar stars and hot up-and-comers, performances were stocked in unusual pairings.
Some three months ago it was a hot, up-and-comer in the New York tech scene, backed by some of the biggest name angels in the business.
This information is particularly useful in the early phases of geothermal exploration, especially for hidden geothermal systems and epithermal mineralization, where establishing the location of hot up-flow zones and high temperature discharge vents is favorable.
After all, they got rid of Strong to hire hot up-and-comer Tom Herman, who led Houston to a 9-3 season that included losses to underdogs Navy, Southern Methodist and Memphis.
