in heat

Idioms  

1. In a state of sexual excitement immediately preceding ovulation. For example, Our cat's in heat so we have to keep her inside. This expression applies to most female mammals and indicates the period when the animal is fertile and most receptive to mating. [Mid-1700s]

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Example Sentences

If successful, Karman could dent the market share of Trane Technologies and Schneider Electric, the leaders in heat rejection systems.

From Los Angeles Times

This same process occurs in heat pumps designed to supply single homes, it just happens on a much larger scale in giant heat pumps that serve entire city districts.

From BBC

This achievement confirms that material purity plays a decisive role in heat transfer performance and opens a path toward even more efficient heat-conducting materials.

From Science Daily

The Celtic powerbrokers, who have been engulfed in heat from the fans, knew what they were doing with this one.

From BBC

Another growing use case is in data centers, where aluminum is used in heat sinks, cooling systems and the structures themselves.

From The Wall Street Journal