Become acute or intense, as in If inflation heats up, the interest rate will surely rise, or The debate over the budget was heating up. [Early 1200s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use heat up in a sentence
Tensions are rising in Saint Louis, Mo., as race relations heat up.
With people fighting for food, violent outbreaks between Liberians and the army began to heat up at the 10-day mark.
Observers say the row is expected to heat up further in the weeks leading up to local elections on March 30.Does Alleged Corruption Video Spell the End Of Turkey’s Erdogan? | Thomas Seibert | February 27, 2014 | THE DAILY BEAST
Turn the heat up a little and partially cover the pan to give the vegetables a cook.
She said that things started to "heat up" after a young boy was arrested—the police came in wearing riot gear and on horseback.
For the next seven minutes I "thickened the heat up" by adding iron oxide to the bath.The Iron Puddler | James J. Davis
The molecular beams are instantly irresistible, while the heat beams take time to heat up the target.Islands of Space | John W Campbell
The relux plate, subject now to eddy currents, since there was no other path for the energy to take, began to heat up rapidly.Islands of Space | John W Campbell
The peas were turned out of the can, drained, seasoned and made ready to heat up quickly.Living on a Little | Caroline French Benton
Without these safeguards, the overloaded electric line will heat up and may start a fire.Electricity for the 4-H Scientist | Eric B. Wilson