'a time'はこちらの項目にも見つかりました。
英語の見出し語に対する説明:
appoint
- back when
- by installment
- by the dozen
- by twos
- chime
- distant past
- drop by drop
- have lined up
- in dribs and drabs
- in installment
- in small doses
- in turn
- individually
- one after the other
- one by one
- piece by piece
- reappearance
- scheduling
- slot
- turn
- when
- whenever you like
- whenever you wish