a book or an app with spaces for each day of the year in which you can record things you have to do in the future (工作日程)记事簿 I wrote it down in my datebook so I wouldn’t forget. 我把此事记在记事本上,这样就不会忘记了。
Oxford Collocations Dictionaryverb + datebook- note something down in
- put something (down) in
- write something (down) in
- …
- in a/your datebook