unknown quantity
непредсказуемая (личность)
Пример использования идиомы unknown quantity:
The new footballer was still an unknown quantity for the coach; he didn't know how good he was in the game.
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Другие идиомы:
- until the cows come home
- ugly duckling
- under the wings of (someone)
- up the ante
- under one's belt
- university of life
- up to one's ears/eyeballs/neck in (something)
- under (someone's) nose
- upset the applecart
- under one's thumb
- use some elbow grease
- up in arms
- use one's head/noggin/noodle
- up to one's chin in (something)
- UFO