Use 'heat up' for usual items like leftovers, not raw ingredients to cook.

Common Foods

'Heat up' implies a fast way to make something hot, not long cooking times.

Quick Process

It's commonly used when referring to microwave heating, but not exclusively.

'Heat up' suggests a gradual build-up, not an immediate change.

Can refer to positive excitement or negative tension getting stronger.

Often used to describe increased competition in sports or gaming.

Indicates a shift from calm to more aggressive or animated argument.

Reflects a change in emotion, often from neutral to anger or frustration.

Can be used to signal that a situation is escalating and might need intervention.