A warning or alert to pay attention to something approaching or about to happen. It can also mean advance notice or a brief informational update.
The phrase originally came from sports and work environments where someone would shout 'heads up!' to warn others of incoming objects that might hit them. It literally meant to lift your head and look up to avoid danger.
The evolution from a safety warning to a general alert shows how workplace language adapts to new contexts. In the digital age, 'heads up' has become gentler, often used in emails to politely notify someone of upcoming changes rather than warn of immediate physical danger.
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