have a heart

Idioms  

1. Be merciful, show pity; also, be reasonable. For example, Have a heart—I can't pay you back until next month, or Have a heart and stop your arguing now. This expression is often put as an imperative, as in the examples. [c. 1900] Also see harden one's heart.

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Example Sentences

You’d have to have a heart of stone not to laugh.

From MarketWatch

"If you have high cholesterol, it doesn't mean that you will have a heart attack soon. But it's time to take drugs to lower your cholesterol levels to prevent that heart attack from happening down the road. NU-9 could play a similar role. If someone has a biomarker signaling Alzheimer's disease, then they could start taking NU-9 before symptoms appear."

From Science Daily

This does not mean someone is about to have a heart attack, but it can give an early warning they might be more at risk of a stroke, blood clot or heart problems in the future.

From BBC

Research also suggests that elderly patients are more likely to have a heart attack following an infection - although it is less conclusive.

From BBC

“But no one says, ‘I think I’m going to have a heart attack next year.’

From MarketWatch