an unknown quantity
Meaning: If a thing or a person is an unknown quantity, not much is known about them.
For example:
- The Saints have signed a new player, but he's an unknown quantity at this stage as very few people have seen him play.
- We've all heard stories about a great new Ferrari engine, but it's still an unknown quantity as far as racing is concerned.
Quick Quiz:
Our new sales manager is an unknown quantity because
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