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Từ điển Oxford Advanced Learner 8th
sign in
ˌsign ˈin/ˈout | ˌsign sbˈin/ˈout derived
to write your/sb's name when you arrive at or leave an office, a club, etc
•All visitors must sign in on arrival.
•You must sign guests out when they leave the club.
Main entry: ↑signderived
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