To make contact or communicate briefly to provide updates, confirm status, or maintain connection.
Originally from hotel terminology (1920s) where guests would register or 'check in' upon arrival. Extended to general communication by the 1960s, maintaining the sense of registering one's presence or status.
The phrase has evolved from a physical location-based action to our digital age's most common form of lightweight communication. It perfectly captures our modern need for frequent but low-commitment social and professional contact - we're always 'checking in' but rarely fully 'checking out.'
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