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 ones that grow to the heaviest masses the fastest collapse first, grow the most massive, and heat up.
—
Big Think, 17 Apr. 2026
The capsule also faced heat up to 5,000 degrees Fahrenheit.
—ABC News, 16 Apr. 2026
Either way, the number of providers will increase, competition will heat up, and learners should benefit through more options, more entry points and more flexible pacing.
—Ian Gibson, Chicago Tribune, 16 Apr. 2026
He is started to heat up in Baltimore.
—Adam Thompson, CBS News, 15 Apr. 2026
See All Example Sentences for heat up
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Big Think, 17 Apr. 2026
The capsule also faced heat up to 5,000 degrees Fahrenheit.
—ABC News, 16 Apr. 2026
Either way, the number of providers will increase, competition will heat up, and learners should benefit through more options, more entry points and more flexible pacing.
—Ian Gibson, Chicago Tribune, 16 Apr. 2026
He is started to heat up in Baltimore.
—Adam Thompson, CBS News, 15 Apr. 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 22 Apr. 2026.
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