heat up
verb
heated up; heating up; heats up
1
: to become warm or hot
The morning started out cold but it heated up quickly.
2
: to become more active, intense, or angry
Their conversation started to heat up.
Competition between the two companies is heating up.
3
heat (something) up
or heat up (something)
: to cause (something) to become warm or hot
Could you heat up the vegetables, please?
Examples of heat up in a Sentence
Recent Examples on the Web
The British political scene is heating up once again.
—
Leonie Kidd, CNBC, 19 June 2026
Our top hair straighteners under $100 This $30 straightener heats up in 30 seconds flat and delivers a shiny, frizz-free finish that holds all day without creasing, flyaways, or static.
—Alanna Martine Kilkeary, Glamour, 18 June 2026
As the weather continues to heat up—and 4th of July celebrations approach—the novelty of the season starts to fully settle in.
—Rebecca Norris, InStyle, 18 June 2026
The sunny season is really just heating up, but Palmer has been turning out look after look in anticipation of summer, this perky ponytail included.
—Kara Nesvig, Allure, 18 June 2026
See All Example Sentences for heat up
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Leonie Kidd, CNBC, 19 June 2026
Our top hair straighteners under $100 This $30 straightener heats up in 30 seconds flat and delivers a shiny, frizz-free finish that holds all day without creasing, flyaways, or static.
—Alanna Martine Kilkeary, Glamour, 18 June 2026
As the weather continues to heat up—and 4th of July celebrations approach—the novelty of the season starts to fully settle in.
—Rebecca Norris, InStyle, 18 June 2026
The sunny season is really just heating up, but Palmer has been turning out look after look in anticipation of summer, this perky ponytail included.
—Kara Nesvig, Allure, 18 June 2026
See All Example Sentences for heat up
Cite this Entry
“Heat up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heat%20up. Accessed 21 Jun. 2026.
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