The processes of registering arrival at hotels, airports, or other locations, or periodic status updates. Plural of checkin.
Compound of 'check' (from Old French 'eschec' meaning 'a check in chess') and 'in', formed in the 20th century for hospitality and travel industries. The chess metaphor suggests marking or verifying a position.
The word borrows from chess strategy! Just as players 'check' their opponent's king position, travelers 'check in' to verify their position in the system, whether at a hotel desk or through a social media post.
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