What does "heat up" mean?

To develop a fever For body temperature to rise.

How do you use "heat up" in a sentence?

He's heating up - check his temperature. I started to heat up during the night. The baby is heating up.

Phrasal Verb BritishAmericanAustralian ★★★☆☆ Moderate informal

Meaning: To develop a fever

发烧

Tener fiebre, calentarse

熱が出る

열이 나다

For body temperature to rise.

体温升高。特别用于描述开始发烧的症状。

Para la temperatura corporal que sube. Se usa especialmente para describir los primeros síntomas de fiebre.

体温が上がること。特に発熱の初期症状について使われる。

체온이 올라가는 것을 의미한다.

Base verb: heat

Particle: up

Separable: No — the verb and particle stay together

He's heating up - check his temperature.
他在发烧，量一下体温
Está caliente, tómale la temperatura
熱が出てきた。体温を測って
열이 오르고 있어. 체온을 재봐.
I started to heat up during the night.
我半夜开始发烧
Empecé a tener fiebre por la noche
夜中に熱が出始めた
밤중에 열이 나기 시작했어.
The baby is heating up.
宝宝在发烧
El bebé está con fiebre
赤ちゃんが熱を出している
아기가 열이 나고 있어.

Context: fever, temperature, illness

Tone: concerned

From body temperature rising.

Era: Modern

Generation: All ages

Social background: Universal