To be under intense pressure, facing a deadline, or in a situation requiring immediate action.
This phrase originated in the early 20th century American slang, likely drawing from the literal image of being threatened at gunpoint where immediate compliance is demanded. It may also reference being 'under fire' in military contexts.
The phrase captures the physical sensation of pressure perfectly - when we're stressed, our bodies often react as if we're in actual physical danger, with increased heart rate and adrenaline. It's fascinating how our language preserves these fight-or-flight metaphors even in office environments.
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