9 [ADV] modal ADV △You use well after verbs such as `may' and `could' when you are saying what you think is likely to happen.
- The murderer may well come from the estate...
- Ours could well be the last generation for which moviegoing has a sense of magic.
may/might/could well △used to say that something is likely to happen or is likely to be true
- What you say may well be true.
- You could try the drugstore, but it might well be closed by now.
4. can/could well: easily
- She could well afford to pay for it herself.
5. can/could/may/might well: probably
- You may well be right.
- It may well be that the train is delayed.
6. can/could/may/might well: with good reason
- I can't very well leave now.
- I couldn't very well refuse to help them, could I?
- ‘What are we doing here?’ ‘You may well ask (= I don't really know either).’
10) (preceded by could, might, or may) indeed
- you may well have to do it yourself
.... COBUILD, LDOCE, OALD, COLLINS