too hot to hold

apron-string hold

An estate held by a man during his wife's life.

baking hot

Very hot.

blow hot air

To engage in empty or exaggerated talk that lacks substance, credibility, or truth; to bluster.

blow hot and cold

To behave inconsistently; to vacillate or to waver, as between extremes of opinion or emotion.

boiling hot

Extremely hot (having a high temperature: of an object, the weather, a living creature).

buy and hold

A passive investment strategy where an investor purchases an asset and retains it for many years, rather than trading it frequently.

come in hot

To enter the scene of conflict quickly and aggressively.

don't hold your breath

Don't wait. Said cynically to suggest that what has just been mentioned is unlikely to happen soon or at all.