To lie or say untrue things to make yourself or something else look better.
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To say things that sound good but are not true.
When someone blows smoke, they talk big with nothing behind it.
The aim is to impress you or keep you happy.
"Blowing Hot Air"
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Very similar — making empty talk with no substance; blowing smoke often implies more deliberate deception
"Spin"
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To present information in a favourable but misleading way — more strategic than blowing smoke
"Blow Smoke"
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Making empty, exaggerated, or misleading statements with no real substance or follow-through