Mr Green arrived at six on the dot.sevensev‧en /ˈsevən/ ●●● S2 W2 number 
The women visited cities in seven states. We close the store at seven (=seven o'clock). ‘How old’s Sam?’ ‘He’s seven (=seven years old).’2the seven year itch the idea that after seven years of being married, many people start to want a relationship with someone new – used humorously → at sixes and sevens at six(3)
WORD ORIGINseven
Origin:
Old English seofonCOLLOCATIONS FROM OTHER ENTRIES It’s a quarter of seven (=6.45).
(=at exactly 3:00/7:30 etc) Mr Green arrived at six on the dot.
Mr Green arrived at six on the dot. It’s a quarter of seven (=6.45). (=seven bad feelings or desires, in the Christian religion, for example greed or too much pride)
(=an amount in the ten thousands, hundred thousands etc)· The newspaper paid a six-figure sum for the photograph of the princess.
PHRASES FROM THE ENTRYPHRASES FROM OTHER ENTRIES► be five/six/seven etc months gone► at sixes and sevens
1the number 7: - We've been together eight years now - so we're over the seven year itch, not that I had one.
- Arthur would be gone on the stroke of nine, and Ann too, if it was possible.
The women visited cities in seven states. We close the store at seven (=seven o'clock). ‘How old’s Sam?’ ‘He’s seven (=seven years old).’2the seven year itch the idea that after seven years of being married, many people start to want a relationship with someone new – used humorously → at sixes and sevens at six(3)