Wiktionary
vb. (en-third-person singularwarm up)
Usage examples of "warms up".
It is freezing outside right now so I stay in the house cozy and protected for most of the time until it warms up again when winter is finished.
Perhaps he would have to be making more to maintain warms up it and wide-awake.
Jack has a touch of claustrophobia in his makeup, and now this circuit warms up, increasing his discomfort.
I plant and sow and reap and mow and am a farmer's boy until early June every year, and then, as the weather warms up I take to the hammock and trouble the soil no more until it is time to rake the leaves in Autumn.
It may seem unsurprising that when the Earth receives more heat from the sun, it warms up, and when it doesn't, it cools down, but not all of the heat that reaches the upper atmosphere gets down to the ground.
That means that the cosmeg slowly undergoes fusion at a greater rate and gradually warms up.