Etymology
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red-hot (adj.)

late 14c., "red with heat, heated till it glows red" (of metal, etc.); in reference to persons, "lively, passionate," it is recorded from c. 1600. Red-hot mama is 1926, jazz slang, "earthy female singer," also "girlfriend, lover."

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Definitions of red-hot

red-hot (adj.)
having strong sexual appeal;
a red-hot mama
red-hot (adj.)
newest or most recent;
red-hot information
Synonyms: hot
red-hot (adj.)
characterized by intense emotion or interest or excitement;
a red-hot speech
Synonyms: sizzling
red-hot (adj.)
glowing red with heat;
red-hot (adj.)
very fast; capable of quick response and great speed;
a red-hot line drive
Synonyms: blistering / hot
From wordnet.princeton.edu