[check in] vi (1918) 1: to register at a hotel
2: to report one's presence or arrival "check in at a convention" ~ vt: to satisfy all requirements in returning "check in the equipment after using"
[check in] vi (1918) 1: to register at a hotel
2: to report one's presence or arrival "check in at a convention" ~ vt: to satisfy all requirements in returning "check in the equipment after using"
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012